Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Defined Benefit Retirement Plans
Amounts recognized on the balance sheet:
Amounts unrelated to service costs, benefit	$ 1.0	$ 0.5	$ 3.0	$ 1.6
Defined Benefit Retirement Plans | U.S.
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans			4.4	0.4
Expected employer contribution in full current year	4.6		4.6
Net amortization gain deferral	$ (0.1)	$ (0.1)	$ (0.1)	$ (0.3)
Defined Benefit Plan, Tax Status [Extensible List]	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember
Defined Benefit Retirement Plans | European
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans			$ 3.8	$ 2.8
Expected employer contribution in full current year	$ 5.0		5.0
Net amortization gain deferral			(0.2)	(0.2)
Postretirement Health Care and Life Insurance Benefit Plans
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans			0.3	0.3
Expected employer contribution in full current year	0.4		0.4
Net amortization gain deferral	$ 0.0	$ 0.3	$ 0.9	$ 0.9