Retirement Benefits and Postemployment Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 27, 2012 employees	May 29, 2011	May 30, 2010
Defined Benefit Plan Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate for next year	8.50%	8.50%
Year that the rate reaches the ultimate trend rate	2019	2019
Rate to which the cost trend rate is assumed to decline (ultimate rate)	5.20%	5.20%
Defined Benefit Plan Effect Of One Percentage Point Change In Assumed Health Care Cost Trend Rates [Abstract]
Effect on the aggregate of the service and interest cost components next year	$ 5.7
Effect on the other postretirement accumulated benefit obligation as of current year end	96.7
Effect on the aggregate of the service and interest cost components next year	(4.7)
Effect on the other postretirement accumulated benefit obligation as of current year end	(85.4)
Defined Benefit Plan Change In Benefit Obligation Roll Forward [Abstract]
Accumulated Benefit Obligation	4,504.7	3,991.6
Defined Benefit Plan Amounts Recognized In Accumulated Other Comprehensive Loss [Abstract]
Net actuarial loss	(1,945.9)	(1,509.5)
Prior service costs (credits)	(7.2)	(20.7)
Amounts recorded in accumulated other comprehensive loss	(1,953.1)	(1,530.2)
Defined Benefit Plan Estimated Future Benefit Payments [Abstract]
Prescription Drug Subsidy Receipts, Year One	5.3
Prescription Drug Subsidy Receipts Year Two	5.8
Prescription Drug Subsidy Receipts Year Three	6.3
Prescription Drug Subsidy Receipts Year Four	6.9
Prescription Drug Subsidy Receipts Year Five	7.5
Prescription Drug Subsidy Receipts Five Fiscal Years Thereafter	34.5
Multiemployer Plans [Abstract]
Multiemployer Plan Number	001
Multiemployer Plan Number Of Employees	20
Multiemployer Plans Period Contributions Significance Of Contributions	false
Defined Contribution Pension And Other Postretirement Plans Disclosure [Abstract]
Description Of Defined Contribution Pension And Other Postretirement Plans	We matched a percentage of employee contributions to the General Mills Savings Plan with a base match plus a variable year-end match that depended on annual results.
Net assets money purchase plan	18.7	18.1
Cost recognized	41.8	41.8	64.5
ESOP number of allocated shares	10.6	11.2
ESOP compensation expense			53.7
Common stock held by ESOP and company stock fund	638.6	648.1
Defined Contribution Plan Employer Discretionary Contribution Amount	200.0	200.0
Postretirement Plan Other Changes	24.0
Maximum [Member]
Multiemployer Plans [Abstract]
Multiemployer Plan, Period Contributions	1.0
Multiemployer Plan, Withdrawal Obligation	1.0
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	4,264.0	3,529.8
Actual return on assets	56.3	688.9
Employer contributions	222.1	220.7
Plan participant contributions	20.3	4.1
Benefits Payments	(203.3)	(188.2)
Foreign currency	(5.5)	8.7
Fair value at end of year	4,353.9	4,264.0	3,529.8
Defined Benefit Plan Change In Benefit Obligation Roll Forward [Abstract]
Benefit obligation at beginning of year	4,458.4	4,030.0
Interest cost	237.9	230.9	230.3
Plan amendment	(13.4)	0
Curtailment/other	(27.1)	0
Medicare Part D reimbursements	0	0
Actuarial loss (gain)	405.7	271.2
Benefits payments	(203.5)	(188.2)
Foreign currency	(5.9)	9.0
Acquisitions	4.8	0
Projected benefit obligation at end of year	4,991.5	4,458.4	4,030.0
Plan assets less than benefit obligation as of fiscal year end	(637.6)	(194.4)
Defined Benefit Plan Amounts Recognized In Accumulated Other Comprehensive Loss [Abstract]
Net actuarial loss	(1,714.1)	(1,313.9)
Prior service costs (credits)	(22.0)	(35.8)
Amounts recorded in accumulated other comprehensive loss	(1,736.1)	(1,349.7)
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]
Projected benefit obligation	423.4	335.1
Accumulated benefit obligation	361.5	280.6
Plan assets at fair value	53.0	9.0
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]
Service cost	114.3	101.4	70.9
Interest cost	237.9	230.9	230.3
Expected return on plan assets	(440.3)	(408.5)	(400.1)
Amortization of losses	108.1	81.4	8.4
Amortization of prior service costs (credits)	8.6	9.0	6.9
OtherAdjustments	0	0	0
Net (income) expense	28.6	14.2	(83.6)
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year [Abstract]
Amortization of losses	136.0
Amortization of prior service costs (credits)	6.2
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	4.85%	5.45%
Rate of salary increases	4.44%	4.92%
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract
Discount rate	5.45%	5.85%	7.49%
Rate of salary increases	4.92%	4.93%	4.92%
Expected long-term rate of return on plan assets.	9.52%	9.53%	9.55%
Defined Benefit Plan Assets Fair Value [Abstract]
Actual Return Attributable To Unrealized Gain Loss On Plan Assets Still Held	32.1
Defined Benefit Plan Weighted Average Asset Allocations [Abstract]
Fixed income	28.60%	23.90%
Real assets	13.70%	13.60%
Target allocation percentage of assets fixed income funds	35.00%
Target allocation percentage of assets real assets	15.00%
Defined Benefit Plan Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	217.5
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	226.5
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	236.0
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	245.8
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	256.9
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	1,470.4
Defined Benefit Pension Plans [Member] | United States Equity Securities [Member]
Defined Benefit Plan Weighted Average Asset Allocations [Abstract]
Defined Benefit Plan Equity Securities	28.70%	30.10%
Target Allocation Percentage Of Assets Equity Securities	25.00%
Defined Benefit Pension Plans [Member] | International Equity Securities [Member]
Defined Benefit Plan Weighted Average Asset Allocations [Abstract]
Defined Benefit Plan Equity Securities	15.70%	18.90%
Target Allocation Percentage Of Assets Equity Securities	15.00%
Defined Benefit Pension Plans [Member] | Private Equities [Member]
Defined Benefit Plan Weighted Average Asset Allocations [Abstract]
Defined Benefit Plan Equity Securities	13.30%	13.50%
Target Allocation Percentage Of Assets Equity Securities	10.00%
Defined Benefit Pension Plans [Member] | Equity [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	2,412.2	2,521.2
Defined Benefit Pension Plans [Member] | Fixed income [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	1,153.3	969.3
Defined Benefit Pension Plans [Member] | Real asset investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	585.1	565.1
Defined Benefit Pension Plans [Member] | Other Investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	49.9	52.5
Defined Benefit Pension Plans [Member] | Cash and accruals [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	153.4	155.9
Defined Benefit Pension Plans [Member] | Level 1 [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	1,913.7	2,116.1
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Equity [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	1,119.2	1,052.5
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Fixed income [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	506.1	794.7
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Real asset investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	135.0	113.0
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Other Investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	0	0
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Cash and accruals [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	153.4	155.9
Defined Benefit Pension Plans [Member] | Level 2 [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	1,503.3	1,222.0
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Equity [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	717.6	900.2
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Fixed income [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	647.2	174.4
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Real asset investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	88.9	95.2
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Other Investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	49.6	52.2
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Cash and accruals [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	0	0
Defined Benefit Pension Plans [Member] | Level 3 [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	925.9	815.7
Fair value at end of year	936.9	925.9
Defined Benefit Plan Assets Fair Value [Abstract]
Transfers In/(Out)	(50.1)	1.5
Purchases, Sales Issuances, and Settlements (Net)	4.2	(36.4)
Actual return on plan assets still held	56.9	145.1
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Equity [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	568.5	512.8
Fair value at end of year	575.4	568.5
Defined Benefit Plan Assets Fair Value [Abstract]
Transfers In/(Out)	(1.2)	2.4
Purchases, Sales Issuances, and Settlements (Net)	(28.4)	(48.1)
Actual return on plan assets still held	36.5	101.4
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Fixed income [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	0.2	3.9
Fair value at end of year	0	0.2
Defined Benefit Plan Assets Fair Value [Abstract]
Transfers In/(Out)	0	(0.9)
Purchases, Sales Issuances, and Settlements (Net)	(0.2)	(4.3)
Actual return on plan assets still held	0	1.5
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Real asset investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	356.9	298.7
Fair value at end of year	361.2	356.9
Defined Benefit Plan Assets Fair Value [Abstract]
Transfers In/(Out)	(48.9)	0
Purchases, Sales Issuances, and Settlements (Net)	32.8	16.0
Actual return on plan assets still held	20.4	42.2
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Other Investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	0.3	0.3
Fair value at end of year	0.3	0.3
Defined Benefit Plan Assets Fair Value [Abstract]
Transfers In/(Out)	0	0
Purchases, Sales Issuances, and Settlements (Net)	0	0
Actual return on plan assets still held	0	0
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Cash and accruals [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	0	0
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Estimated Future Benefit Payments [Abstract]
Retirement Plan Provision Termination Period	5 years
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	353.8	284.3
Actual return on assets	(4.8)	60.7
Employer contributions	0.1	0.1
Plan participant contributions	12.2	11.8
Benefits Payments	(2.5)	(3.1)
Foreign currency	0	0
Fair value at end of year	358.8	353.8	284.3
Defined Benefit Plan Change In Benefit Obligation Roll Forward [Abstract]
Benefit obligation at beginning of year	1,065.8	1,060.6
Interest cost	55.6	60.1	61.6
Plan amendment	0	(35.3)
Curtailment/other	0.1	0
Medicare Part D reimbursements	4.7	4.5
Actuarial loss (gain)	28.4	2.0
Benefits payments	(55.5)	(56.9)
Foreign currency	(0.3)	0.3
Acquisitions	0	0
Projected benefit obligation at end of year	1,129.0	1,065.8	1,060.6
Plan assets less than benefit obligation as of fiscal year end	(770.2)	(712.0)
Defined Benefit Plan Amounts Recognized In Accumulated Other Comprehensive Loss [Abstract]
Net actuarial loss	(215.0)	(181.3)
Prior service costs (credits)	19.0	20.7
Amounts recorded in accumulated other comprehensive loss	(196.0)	(160.6)
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]
Projected benefit obligation	0	0
Accumulated benefit obligation	1,129.0	1,065.8
Plan assets at fair value	358.8	353.8
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]
Service cost	18.0	18.7	12.9
Interest cost	55.6	60.1	61.6
Expected return on plan assets	(35.5)	(33.2)	(29.2)
Amortization of losses	14.5	14.4	2.0
Amortization of prior service costs (credits)	(3.4)	(0.6)	(1.6)
OtherAdjustments	0	0	0
Net (income) expense	49.2	59.4	45.7
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year [Abstract]
Amortization of losses	17.3
Amortization of prior service costs (credits)	(3.4)
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	4.70%	5.35%
Rate of salary increases	0.00%	0.00%
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract
Discount rate	5.35%	5.80%	7.45%
Rate of salary increases	0.00%	0.00%	0.00%
Expected long-term rate of return on plan assets.	9.32%	9.33%	9.33%
Defined Benefit Plan Assets Fair Value [Abstract]
Actual Return Attributable To Unrealized Gain Loss On Plan Assets Still Held	5.2
Defined Benefit Plan Weighted Average Asset Allocations [Abstract]
Fixed income	30.30%	30.10%
Real assets	5.20%	6.30%
Target allocation percentage of assets fixed income funds	30.00%
Target allocation percentage of assets real assets	10.00%
Defined Benefit Plan Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	58.6
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	62.1
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	64.6
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	66.2
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	68.9
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	382.2
Other Postretirement Benefit Plans [Member] | United States Equity Securities [Member]
Defined Benefit Plan Weighted Average Asset Allocations [Abstract]
Defined Benefit Plan Equity Securities	38.40%	37.60%
Target Allocation Percentage Of Assets Equity Securities	30.00%
Other Postretirement Benefit Plans [Member] | International Equity Securities [Member]
Defined Benefit Plan Weighted Average Asset Allocations [Abstract]
Defined Benefit Plan Equity Securities	19.90%	18.70%
Target Allocation Percentage Of Assets Equity Securities	20.00%
Other Postretirement Benefit Plans [Member] | Private Equities [Member]
Defined Benefit Plan Weighted Average Asset Allocations [Abstract]
Defined Benefit Plan Equity Securities	6.20%	7.30%
Target Allocation Percentage Of Assets Equity Securities	10.00%
Other Postretirement Benefit Plans [Member] | Equity [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	170.0	170.8
Other Postretirement Benefit Plans [Member] | Fixed income [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	54.8	57.9
Other Postretirement Benefit Plans [Member] | Real asset investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	18.4	20.8
Other Postretirement Benefit Plans [Member] | Other Investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	104.9	83.9
Other Postretirement Benefit Plans [Member] | Cash and accruals [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	10.7	20.4
Other Postretirement Benefit Plans [Member] | Level 1 [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	43.3	35.7
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Equity [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	12.6	13.5
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Fixed income [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	15.7	1.8
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Real asset investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	4.3	0
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Other Investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	0	0
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Cash and accruals [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	10.7	20.4
Other Postretirement Benefit Plans [Member] | Level 2 [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	285.1	278.0
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Equity [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	135.4	131.0
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Fixed income [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	39.1	55.9
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Real asset investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	5.7	7.2
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Other Investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	104.9	83.9
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Cash and accruals [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	0	0
Other Postretirement Benefit Plans [Member] | Level 3 [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	40.1	42.0
Fair value at end of year	30.4	40.1
Defined Benefit Plan Assets Fair Value [Abstract]
Transfers In/(Out)	(4.0)	0
Purchases, Sales Issuances, and Settlements (Net)	(5.2)	(7.4)
Actual return on plan assets still held	(0.5)	5.5
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Equity [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	26.3	25.7
Fair value at end of year	22.0	26.3
Defined Benefit Plan Assets Fair Value [Abstract]
Transfers In/(Out)	0	0
Purchases, Sales Issuances, and Settlements (Net)	(4.1)	(3.7)
Actual return on plan assets still held	(0.2)	4.3
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Fixed income [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	0.2	1.7
Fair value at end of year	0	0.2
Defined Benefit Plan Assets Fair Value [Abstract]
Transfers In/(Out)	0	0
Purchases, Sales Issuances, and Settlements (Net)	0	(1.5)
Actual return on plan assets still held	(0.2)	0
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Real asset investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	13.6	14.6
Fair value at end of year	8.4	13.6
Defined Benefit Plan Assets Fair Value [Abstract]
Transfers In/(Out)	(4.0)	0
Purchases, Sales Issuances, and Settlements (Net)	(1.1)	(2.2)
Actual return on plan assets still held	(0.1)	1.2
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Other Investments [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	0	0
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Cash and accruals [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Fair value at end of year	0	0
Postemployment Benefit Plans [Member]
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Plan participant contributions	0	0
Defined Benefit Plan Change In Benefit Obligation Roll Forward [Abstract]
Benefit obligation at beginning of year	131.3	130.3
Interest cost	4.8	5.1	5.7
Plan amendment	0	0
Curtailment/other	11.9	4.2
Medicare Part D reimbursements	0	0
Actuarial loss (gain)	5.5	(0.5)
Benefits payments	(19.6)	(16.1)
Foreign currency	(0.1)	0.3
Acquisitions	0	0
Projected benefit obligation at end of year	141.3	131.3	130.3
Plan assets less than benefit obligation as of fiscal year end	(141.3)	(131.3)
Defined Benefit Plan Amounts Recognized In Accumulated Other Comprehensive Loss [Abstract]
Net actuarial loss	(16.8)	(14.3)
Prior service costs (credits)	(4.2)	(5.6)
Amounts recorded in accumulated other comprehensive loss	(21.0)	(19.9)
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]
Projected benefit obligation	0	0
Accumulated benefit obligation	141.3	131.3
Plan assets at fair value	0	0
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]
Service cost	7.5	8.0	7.2
Interest cost	4.8	5.1	5.7
Expected return on plan assets	0	0	0
Amortization of losses	1.7	2.1	1.0
Amortization of prior service costs (credits)	2.1	2.4	2.4
OtherAdjustments	12.0	4.2	10.6
Net (income) expense	28.1	21.8	26.9
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year [Abstract]
Amortization of losses	2.2
Amortization of prior service costs (credits)	1.9
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	3.86%	4.77%
Rate of salary increases	4.45%	4.92%
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract
Discount rate	4.77%	5.12%	7.06%
Rate of salary increases	4.92%	4.93%	4.93%
Expected long-term rate of return on plan assets.	0.00%	0.00%	0.00%
Defined Benefit Plan Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	19.3
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	17.6
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	16.3
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	15.3
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	14.6
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 66.7