Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Defined Benefit Retirement Plans
Amounts recognized on the balance sheet:
Amounts unrelated to service costs, benefit	$ 1.1	$ 0.5
Defined Benefit Retirement Plans | U.S.
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans	0.1		$ 0.1
Expected employer contribution in full current year	$ 4.6
Net amortization gain deferral		$ (0.1)
Defined Benefit Plan, Tax Status [Extensible List]	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	$ 1.6	$ 1.3
Expected employer contribution in full current year	5.0
Net amortization gain deferral	(0.1)	(0.1)
Postretirement Health Care and Life Insurance Benefit Plans
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans	0.1	$ 0.1
Expected employer contribution in full current year	0.2
Net amortization gain deferral	$ 0.3