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Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan employer contribution $ 3.5 $ 3.4 $ 3.4
Net periodic benefit cost: [Abstract]      
Curtailment gain, net (0.2)    
Settlement loss 0.8    
Other changes in plan assets and benefit obligations recognized in other comprehensive income, pre-tax: [Abstract]      
Curtailment gain, net 0.2    
Settlement loss 0.8    
Amounts recognized in balance sheet [Abstract]      
Current liabilities (2.3) (2.1)  
Noncurrent liabilities (126.0) (87.2)  
Estimated future benefit payment [Abstract]      
2012 16.7    
2013 18.1    
2014 21.0    
2015 22.5    
2016 24.4    
2017 to 2021 144.3    
Total 247.0    
Minimum ERISA funding requirement, U.S. qualified plan 17.2    
Allocation range [Abstract]      
Assumed healthcare cost trend rate used to determine benefit obligations (in hundredths) 8.50%    
Ultimate health care cost trend rate (in hundredths) 5.00%    
Year that rate reaches ultimate trend rate 2,019    
One percentage point increase - effect on post-retirement benefit obligation 1.1    
One percentage point decrease - effect on post-retirement benefit obligation 1.0    
Assumed healthcare cost trend rate used to determine net periodic benefit cost (in hundredths) 9.00%    
Ultimate health care cost trend rate for net periodic benefit cost (in hundredths) 5.00%    
Year that rate reaches ultimate trend rate, net periodic benefit cost 2,019    
One percentage point change in the rate - effect on service and interest cost components 0.2    
Cash [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 0.2    
Fair value of assets 0.2    
Allocation range [Abstract]      
Fair value of assets 0.2    
Cash Overdrafts [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end   (0.6)  
Fair value of assets   (0.6)  
Allocation range [Abstract]      
Fair value of assets   (0.6)  
Balanced Mutual Fund [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 4.0    
Fair value of assets 4.0    
Allocation range [Abstract]      
Fair value of assets 4.0    
Indexed Mutual Funds, Equity [Members]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 102.2 108.1  
Fair value of assets 102.2 108.1  
Allocation range [Abstract]      
Fair value of assets 102.2 108.1  
International Mutual Funds, Equity [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 40.0 37.7  
Fair value of assets 40.0 37.7  
Allocation range [Abstract]      
Fair value of assets 40.0 37.7  
Fixed Income Mutual Funds [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 65.6 65.6  
Fair value of assets 65.6 65.6  
Allocation range [Abstract]      
Fair value of assets 65.6 65.6  
Insurance Contract [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 1.3 1.5  
Fair value of assets 1.3 1.5  
Allocation range [Abstract]      
Fair value of assets 1.3 1.5  
Level 1 [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 212.0 210.8  
Fair value of assets 212.0 210.8  
Allocation range [Abstract]      
Fair value of assets 212.0 210.8  
Level 1 [Member] | Cash [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 0.2    
Fair value of assets 0.2    
Allocation range [Abstract]      
Fair value of assets 0.2    
Level 1 [Member] | Cash Overdrafts [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end   (0.6)  
Fair value of assets   (0.6)  
Allocation range [Abstract]      
Fair value of assets   (0.6)  
Level 1 [Member] | Balanced Mutual Fund [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 4.0    
Fair value of assets 4.0    
Allocation range [Abstract]      
Fair value of assets 4.0    
Level 1 [Member] | Indexed Mutual Funds, Equity [Members]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 102.2 108.1  
Fair value of assets 102.2 108.1  
Allocation range [Abstract]      
Fair value of assets 102.2 108.1  
Level 1 [Member] | International Mutual Funds, Equity [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 40.0 37.7  
Fair value of assets 40.0 37.7  
Allocation range [Abstract]      
Fair value of assets 40.0 37.7  
Level 1 [Member] | Fixed Income Mutual Funds [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 65.6 65.6  
Fair value of assets 65.6 65.6  
Allocation range [Abstract]      
Fair value of assets 65.6 65.6  
Level 2 [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 1.3 1.5  
Fair value of assets 1.3 1.5  
Allocation range [Abstract]      
Fair value of assets 1.3 1.5  
Level 2 [Member] | Insurance Contract [Member]
     
Change in benefit obligation: [Roll Forward]      
Fair value of assets, period end 1.3 1.5  
Fair value of assets 1.3 1.5  
Allocation range [Abstract]      
Fair value of assets 1.3 1.5  
Pension Benefits [Member]
     
Net periodic benefit cost: [Abstract]      
Service cost 8.9 8.6 7.8
Interest cost 16.0 15.7 14.9
Expected return on assets (16.0) (14.7) (11.9)
Amortization of prior service (credit) cost (1.5) (1.1) (1.1)
Amortization of transition obligation 0.1 0.1 0.1
Recognized actuarial losses (gains) 6.0 5.6 7.0
Curtailment gain, net (0.2)    
Settlement loss 0.8    
Net periodic benefit cost 14.1 14.2 16.8
Other changes in plan assets and benefit obligations recognized in other comprehensive income, pre-tax: [Abstract]      
Net loss (gain) arising during period 46.7 9.1 (2.9)
Prior service credit arising during period   (5.2)  
Curtailment 0.2    
Settlement effects (0.8)    
Amortization of prior service credit (cost) 1.5 1.1 1.1
Amortization of transition obligation (0.1) (0.1) (0.1)
Amortization of actuarial (loss) gain (6.0) (5.6) (7.0)
Total recognized in other comprehensive income 41.5 (0.7) (8.9)
Total recognized in net periodic benefit cost and other comprehensive income 55.6 13.5 7.9
Curtailment gain, net 0.2    
Settlement loss 0.8    
Change in benefit obligation: [Roll Forward]      
Benefit obligation, beginning period (283.5) (262.8)  
Service cost (8.9) (8.6) (7.8)
Interest cost (16.0) (15.7)  
Actuarial (loss) gain (27.3) (15.9)  
Amendments/transfers in (0.4) 5.2  
Benefits/expenses paid 16.4 12.4  
Curtailment (0.8)    
Foreign currency translation 0.6 1.9  
Benefit obligation, period end (319.9) (283.5) (262.8)
Fair value of assets, beginning period 212.3 193.5  
Actual return on assets (2.8) 21.6  
Employer contribution 20.4 10.3  
Foreign currency translation (0.2) (0.6)  
Benefits/expenses paid (16.4) (12.4)  
Fair value of assets, period end 213.3 212.3 193.5
Funded status at end of year (106.6) (71.2)  
Fair value of assets 213.3 212.3 193.5
Amounts recognized in balance sheet [Abstract]      
Current liabilities (1.2) (1.1)  
Noncurrent liabilities (105.4) (70.1)  
Total (106.6) (71.2)  
Amounts in accumulated other comprehensive loss, pre tax [Abstract]      
Net actuarial loss (gain) 131.3 92.1  
Transition obligation 0.4 0.5  
Prior service (credit) cost (10.2) (12.7)  
Total 121.5 79.9  
Net actuarial loss that will be amortized into net pension expense over the next fiscal year 8.3    
Transition obligation that will be amortized into net pension expense over the next fiscal year 0.1    
Prior service credit that will be amortized into net pension expense over the next fiscal year (1.4)    
Accumulated benefit obligation 316.7 280.4  
Estimated future benefit payment [Abstract]      
Estimated future employer contributions in next fiscal year 19.8    
Weighted-average assumption used to determine net periodic benefit cost [Abstract]      
Discount rate (in hundredths) 5.55% 5.92% 6.38%
Rate of compensation increase (in hundredths) 4.33% 4.36% 4.37%
Long-term rate of return on assets (in hundredths) 7.59% 7.60% 7.66%
Weighted-average assumption used to determine benefit obligation [Abstract]      
Discount rate (in hundredths) 4.87% 5.61%  
Rate of compensation increase (in hundredths) 4.33% 4.36%  
Weighted average asset allocations [Abstract]      
Equity securities (in hundredths) 68.00% 69.00%  
Debt securities (in hundredths) 31.00% 31.00%  
Other (in hundredths) 1.00%    
Total (in hundredths) 100.00% 100.00%  
Allocation range [Abstract]      
Fair value of assets 213.3 212.3 193.5
Other Retirement Benefits [Member]
     
Net periodic benefit cost: [Abstract]      
Service cost 1.2 1.1 0.8
Interest cost 1.0 0.8 0.9
Amortization of prior service (credit) cost 0.1 0.1 0.1
Recognized actuarial losses (gains)   (0.1)  
Net periodic benefit cost 2.3 1.9 1.8
Other changes in plan assets and benefit obligations recognized in other comprehensive income, pre-tax: [Abstract]      
Net loss (gain) arising during period 1.3 (1.5) 1.8
Curtailment 0.4    
Amortization of prior service credit (cost) (0.1) (0.1) (0.1)
Amortization of actuarial (loss) gain   0.1  
Total recognized in other comprehensive income 1.6 (1.5) 1.7
Total recognized in net periodic benefit cost and other comprehensive income 3.9 0.4 3.5
Change in benefit obligation: [Roll Forward]      
Benefit obligation, beginning period (18.1) (18.1)  
Service cost (1.2) (1.1) (0.8)
Interest cost (1.0) (0.9)  
Participants' contributions (0.3) (0.4)  
Actuarial (loss) gain (1.4) 1.5  
Benefits/expenses paid 0.7 0.9  
Curtailment (0.4)    
Benefit obligation, period end (21.7) (18.1) (18.1)
Employer contribution 0.4 0.5  
Participants' contribution 0.3 0.4  
Benefits/expenses paid (0.7) (0.9)  
Funded status at end of year (21.7) (18.1)  
Amounts recognized in balance sheet [Abstract]      
Current liabilities (1.1) (1.0)  
Noncurrent liabilities (20.6) (17.1)  
Total (21.7) (18.1)  
Amounts in accumulated other comprehensive loss, pre tax [Abstract]      
Net actuarial loss (gain) 0.2 (1.5)  
Prior service (credit) cost 0.1 0.2  
Total 0.3 (1.3)  
Prior service credit that will be amortized into net pension expense over the next fiscal year 0.1    
Estimated future benefit payment [Abstract]      
Estimated future employer contributions in next fiscal year 1.1    
Weighted-average assumption used to determine net periodic benefit cost [Abstract]      
Discount rate (in hundredths) 5.25% 5.25% 6.25%
Weighted-average assumption used to determine benefit obligation [Abstract]      
Discount rate (in hundredths) 4.50% 5.25%  
U.S. Other Retirement Benefit Plans [Member]
     
Net periodic benefit cost: [Abstract]      
Net periodic benefit cost 2.3 1.9 1.8
International Pension Benefit Plans [Member]
     
Net periodic benefit cost: [Abstract]      
Net periodic benefit cost 2.7 2.5 1.9
Change in benefit obligation: [Roll Forward]      
Fair value of assets, beginning period 18.6    
Fair value of assets, period end 19.6 18.6  
Fair value of assets 19.6 18.6  
Amounts in accumulated other comprehensive loss, pre tax [Abstract]      
Accumulated benefit obligation 42.6 40.5  
Estimated future benefit payment [Abstract]      
Estimated future employer contributions in next fiscal year 1.8    
Weighted-average assumption used to determine benefit obligation [Abstract]      
Discount rate (in hundredths) 4.72% 5.09%  
Rate of compensation increase (in hundredths) 2.70% 2.71%  
Allocation range [Abstract]      
Fair value of assets 19.6 18.6  
U.S. Pension Benefit Plans [Member]
     
Net periodic benefit cost: [Abstract]      
Net periodic benefit cost 11.4 11.7 14.9
Weighted-average assumption used to determine net periodic benefit cost [Abstract]      
Long-term rate of return on assets (in hundredths) 7.75% 7.75% 7.75%
Weighted-average assumption used to determine benefit obligation [Abstract]      
Discount rate (in hundredths) 4.90% 5.70%  
Rate of compensation increase (in hundredths) 4.50% 4.50%  
Percentage of global plan assets (in hundredths) 91.00%    
Target allocation [Abstract]      
Equity securities (in hundredths) 65.00%    
Debt securities 35.00%    
Allocation range [Abstract]      
Equity securities, minimum (in hundredths) 60.00%    
Equity securities, maximum (in hundredths) 70.00%    
Debt securities, minimum (in hundredths) 30.00%    
Debt securities, maximum (in hundredths) 40.00%    
Other, maximum (in hundredths) 5.00%    
U. S. Plans [Member]
     
Estimated future benefit payment [Abstract]      
2012 15.5    
2013 16.7    
2014 19.4    
2015 20.9    
2016 22.3    
2017 to 2021 130.2    
Total 225.0    
International Plans [Member]
     
Estimated future benefit payment [Abstract]      
2012 1.2    
2013 1.4    
2014 1.6    
2015 1.6    
2016 2.1    
2017 to 2021 14.1    
Total $ 22.0