Retirement Plans - Benefit of Obligations and Plan Assets, Change to Benefit Obligations and Plan Assets, and Funded Status of Defined Benefit Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
United States
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of year	$ 92.2	$ 93.8
Service cost	0	0	1.7
Interest cost	3.2	4.2	4.8
Actuarial (gain) loss	2.2	5.1
Benefits paid	(1.9)	(1.8)
Settlements	(7.4)	(9.1)
Foreign exchange rate changes	0	0
Projected benefit obligation, end of year	88.3	92.2	93.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year	69.6	70.9
Actual return on plan assets	8.5	(0.9)
Foreign exchange rate changes	0	0
Company contributions	2.9	10.5
Benefits paid	(1.9)	(1.8)
Settlements	(7.4)	(9.1)
Fair value of plan assets, end of year	71.7	69.6	70.9
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status of the plan, end of year	(16.6)	(22.6)
International
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of year	55.6	58.9
Service cost	0.6	0.7	0.6
Interest cost	2.2	2.5	2.8
Actuarial (gain) loss	6.9	4.4
Benefits paid	(2.4)	(2.2)
Settlements	0	(8.4)
Foreign exchange rate changes	0.5	(0.3)
Projected benefit obligation, end of year	63.4	55.6	58.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year	53.5	61.2
Actual return on plan assets	3.7	1.6
Foreign exchange rate changes	1.0	(0.3)
Company contributions	2.2	3.8
Benefits paid	(2.4)	(2.2)
Settlements	0	(10.6)
Fair value of plan assets, end of year	58.0	53.5	61.2
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status of the plan, end of year	$ (5.4)	$ (2.1)