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, 2014	Dec. 31, 2013	Dec. 31, 2012
United States
Change in benefit obligation
Projected benefit obligation, beginning of year	$ 78.5	$ 88.3
Service cost	0	0	0
Interest cost	3.3	3.3	3.2
Actuarial (gain) loss	4.4	(1.7)
Benefits paid	(1.8)	(2.0)
Settlements	(5.6)	(9.4)
Foreign exchange rate changes	0	0
Projected benefit obligation, end of year	78.8	78.5	88.3
Change in plan assets
Fair value of plan assets, beginning of year	71.0	71.7
Actual return on plan assets	2.5	10.7
Foreign exchange rate changes	0	0
Company contributions	1.4	0
Benefits paid	(1.8)	(2.0)
Settlements	(5.6)	(9.4)
Fair value of plan assets, end of year	67.5	71.0	71.7
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status of the plan, end of year	(11.3)	(7.5)
International
Change in benefit obligation
Projected benefit obligation, beginning of year	31.4	63.4
Service cost	0.3	0.5	0.6
Interest cost	0.9	2.0	2.2
Actuarial (gain) loss	6.5	(4.7)
Benefits paid	(1.6)	(3.5)
Settlements	0	(24.8)
Foreign exchange rate changes	(4.3)	(1.5)
Projected benefit obligation, end of year	33.2	31.4	63.4
Change in plan assets
Fair value of plan assets, beginning of year	26.1	58.0
Actual return on plan assets	1.6	(3.3)
Foreign exchange rate changes	(3.2)	(1.8)
Company contributions	0.7	1.5
Benefits paid	(1.6)	(3.5)
Settlements	0	(24.8)
Fair value of plan assets, end of year	23.6	26.1	58.0
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status of the plan, end of year	$ (9.6)	$ (5.3)