Retirement and Other Postretirement Benefit Plans - Schedule of Net Periodic Cost of Defined Benefit Retirement and Postretirement Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net periodic benefit costs of defined benefit retirement plans
Net periodic pension cost (income)	$ 5.4	$ 7.3	$ 5.4
U.S. Non-qualified Defined Benefit Retirement Plans
Net periodic benefit costs of defined benefit retirement plans
Service cost	1.1	1.7	1.3
Interest cost	0.7	0.8	1.1
Net amortization	2.0	4.0	2.3
Settlement loss	2.7
Net periodic pension cost (income)	6.5	6.5	4.7
European Defined Benefit Retirement Plans
Net periodic benefit costs of defined benefit retirement plans
Service cost	0.8	0.7	0.5
Interest cost	7.0	6.9	6.6
Expected return on plan assets	(9.6)	(8.0)	(7.3)
Net amortization	0.7	1.2	0.9
Net periodic pension cost (income)	(1.1)	0.8	0.7
U.S. Postretirement Plans
Net periodic benefit costs of defined benefit retirement plans
Interest cost	0.2	0.2	0.3
Net amortization	(0.7)	(0.4)	(0.5)
Net periodic pension cost (income)	$ (0.5)	$ (0.2)	$ (0.2)