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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
U.S.
Net periodic benefit costs of defined benefit retirement plans
Service cost	$ 0.2	$ 0.4	$ 0.8	$ 1.1
Interest cost	0.1	0.1	0.4	0.4
Settlement expense		0.2		0.3
Net amortization and deferral	0.1	0.1	0.1	0.3
Net periodic benefit (credit) cost	$ 0.4	$ 0.8	$ 1.3	$ 2.1
Defined Benefit Plan, Tax Status [Extensible List]	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember
European
Net periodic benefit costs of defined benefit retirement plans
Service cost	$ 0.3	$ 0.3	$ 0.8	$ 0.7
Interest cost	1.2	1.1	3.4	3.3
Expected return on plan assets	(2.4)	(2.0)	(7.1)	(6.1)
Net amortization and deferral			0.2	0.2
Net periodic benefit (credit) cost	$ (0.9)	$ (0.6)	$ (2.7)	$ (1.9)