Retirement and Other Postretirement Benefit Plans (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Retirement and Other Postretirement Benefit Plans
Curtailment gain		$ (5.7)
Net Periodic Pension Expense
Defined benefit retirement plans	5.4	(0.3)	9.0
Union sponsored multi-employer pension plan	1.2	0.9	0.7
Retirement savings plans-matching contributions	3.3	2.9	2.5
Retirement savings plans-profit sharing contributions	7.6	8.0	6.5
Net periodic expense	17.5	11.5	18.7
Net periodic cost of defined benefit retirement and postretirement plans
Curtailment gain		(5.7)
Net periodic pension cost (income)	5.4	(0.3)	9.0
U.S. Non-qualified Defined Benefit Retirement Plans
Retirement and Other Postretirement Benefit Plans
Expected employer contribution in next fiscal year	0.3
Curtailment gain	0
Net Periodic Pension Expense
Defined benefit retirement plans	4.7	4.2	3.1
Net periodic cost of defined benefit retirement and postretirement plans
Service cost	1.3	1.5	1.2
Interest cost	1.1	1.1	1.0
Expected return on plan assets	0
Net amortization and deferral	2.3	1.6	0.9
Curtailment gain	0
Net periodic pension cost (income)	4.7	4.2	3.1
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	3.1	3.3
Amortization of actuarial losses	(2.2)	(1.5)
Amortization of prior service credit (cost)	(0.1)	(0.1)
Total recognized in other comprehensive income (pre-tax)	0.8	1.7
Estimated net actuarial loss to be recognized as a component of net periodic pension cost	3.3
Change in benefit obligation:
Benefit obligation - beginning of year	33.4	27.8
Service cost	1.3	1.5	1.2
Interest cost	1.1	1.1	1.0
Plan participants' contributions	0
Actuarial loss (gain)	3.1	3.3
Benefits and expenses paid	(0.3)	(0.3)
Curtailment and settlements	0
Currency translation adjustments	0
Benefit obligation - end of year	38.6	33.4	27.8
Change in plan assets:
Actual return on plan assets	0
Employer contributions	0.3	0.3
Plan participants' contributions	0
Benefits and expenses paid	0.3	0.3
Currency translation adjustments	0
Fair value of plan assets - end of year	0
Amounts recognized in Consolidated Balance Sheets:
Current liabilities	0.3	0.3
Non-current liabilities	38.3	33.1
Total Liabilities	38.6	33.4
Amounts recognized in Accumulated Other Comprehensive Income:
Actuarial net (loss) gain	(10.2)	(9.4)
Prior service cost	(0.2)	(0.2)
Total amounts recognized in accumulated other comprehensive (loss) income	(10.4)	(9.6)
Total accumulated benefit obligation	38.0	33.0
Defined benefit retirement plans and postretirement benefit plans included within accrued compensation and benefits	1.3	1.4
Defined benefit retirement plans and postretirement benefit plans included within other non-current liabilities	81.9	69.0
Expected benefit payments for the plans
2013	0.2
2014	3.3
2015	24.3
2016	1.6
2017	4.2
2018-2022	5.9
Aggregate expected benefit payments	39.5
U.S. Postretirement Plans
Retirement and Other Postretirement Benefit Plans
Expected employer contribution in next fiscal year	0.6
Net Periodic Pension Expense
Defined benefit retirement plans	(0.2)	0.1	0.4
Net periodic cost of defined benefit retirement and postretirement plans
Service cost	0		0.1
Interest cost	0.3	0.4	0.5
Net amortization and deferral	(0.5)	(0.3)	(0.2)
Net periodic pension cost (income)	(0.2)	0.1	0.4
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	0.1	(1.6)
Amortization of prior service credit (cost)	0.5	0.4
Total recognized in other comprehensive income (pre-tax)	0.6	(1.2)
Change in benefit obligation:
Benefit obligation - beginning of year	8.0	9.4
Service cost	0		0.1
Interest cost	0.3	0.4	0.5
Plan participants' contributions	0.1	0.3
Actuarial loss (gain)	0.1	(1.5)
Benefits and expenses paid	(0.4)	(0.6)
Benefit obligation - end of year	8.1	8.0	9.4
Change in plan assets:
Employer contributions	0.3	0.3
Plan participants' contributions	0.1	0.3
Benefits and expenses paid	0.4	0.6
Amounts recognized in Consolidated Balance Sheets:
Current liabilities	0.6	0.7
Non-current liabilities	7.5	7.3
Total Liabilities	8.1	8.0
Amounts recognized in Accumulated Other Comprehensive Income:
Actuarial net (loss) gain	3.1	3.7
Total amounts recognized in accumulated other comprehensive (loss) income	3.1	3.7
Expected benefit payments for the plans
2013	0.6
2014	0.9
2015	0.8
2016	0.7
2017	0.7
2018-2022	3.0
Aggregate expected benefit payments	6.7
European Defined Benefit Retirement Plans
Retirement and Other Postretirement Benefit Plans
Total plan assets invested in active corporate bond funds (as a percent)	34.00%
Expected long-term weighted average rate of return for next fiscal year (as a percent)	4.40%
Curtailment gain		(5.7)
Service credits recognized as a curtailment gain per diluted share (in dollars per share)	$ 0.04
Net Periodic Pension Expense
Defined benefit retirement plans	0.7	(4.5)	5.9
Net periodic cost of defined benefit retirement and postretirement plans
Service cost	0.5	1.1	3.7
Interest cost	6.6	7.2	7.3
Expected return on plan assets	(7.3)	(7.8)	(6.3)
Net amortization and deferral	0.9	0.7	1.2
Curtailment gain		(5.7)
Net periodic pension cost (income)	0.7	(4.5)	5.9
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	12.1	7.9
Amortization of actuarial losses	(0.9)	(0.9)
Amortization of prior service credit (cost)		5.9
Effect of foreign exchange	1.9	(0.6)
Total recognized in other comprehensive income (pre-tax)	13.1	12.3
Change in benefit obligation:
Benefit obligation - beginning of year	139.8	134.1
Service cost	0.5	1.1	3.7
Interest cost	6.6	7.2	7.3
Plan participants' contributions	0.1	0.1
Actuarial loss (gain)	15.2	4.5
Benefits and expenses paid	(3.7)	(4.7)
Curtailment and settlements		(1.7)
Currency translation adjustments	6.3	(0.8)
Benefit obligation - end of year	164.8	139.8	134.1
Change in plan assets:
Fair value of plan assets - beginning of year	110.8	106.9
Actual return on plan assets	10.3	2.7
Employer contributions	5.7	6.2
Plan participants' contributions	0.1	0.1
Benefits and expenses paid	3.7	4.7
Currency translation adjustments	5.1	(0.4)
Fair value of plan assets - end of year	128.3	110.8	106.9
Amounts recognized in Consolidated Balance Sheets:
Current liabilities	0.4	0.4
Non-current liabilities	36.1	28.6
Total Liabilities	36.5	29.0
Amounts recognized in Accumulated Other Comprehensive Income:
Actuarial net (loss) gain	(49.7)	(36.6)
Prior service cost	(0.1)	(0.1)
Total amounts recognized in accumulated other comprehensive (loss) income	(49.8)	(36.7)
Total accumulated benefit obligation	160.6	136.6
Accumulated benefit obligation in excess of plan assets	32.3	25.8
Expected benefit payments for the plans
2013	3.9
2014	3.7
2015	4.0
2016	4.9
2017	5.9
2018-2022	35.2
Aggregate expected benefit payments	57.6
United Kingdom defined benefit plan (the U.K. Plan)
Retirement and Other Postretirement Benefit Plans
Total plan assets invested in equities (as a percent)	57.00%
Expected long-term weighted average rate of return for next fiscal year (as a percent)	6.50%
Curtailment gain	(5.7)
Service credits recognized as a curtailment gain per diluted share (in dollars per share)	$ 0.04
Net periodic cost of defined benefit retirement and postretirement plans
Curtailment gain	$ (5.7)