Retirement and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs of Defined Benefit Retirement Plans (Details) - Defined Benefit Retirement Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
U.S.
Net periodic benefit costs of defined benefit retirement plans
Service cost	$ 0.3	$ 0.3
Interest cost	0.1	0.2
Net amortization and deferral		0.1
Net periodic benefit (credit) cost	$ 0.4	$ 0.6
Defined Benefit Plan, Tax Status [Extensible List]	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember
European
Net periodic benefit costs of defined benefit retirement plans
Service cost	$ 0.3	$ 0.2
Interest cost	1.1	1.1
Expected return on plan assets	(2.4)	(2.0)
Net amortization and deferral	0.1	0.1
Net periodic benefit (credit) cost	$ (0.9)	$ (0.6)