Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Defined Benefit Retirement Plans
Amounts recognized on the balance sheet:
Amounts unrelated to service costs, benefit	$ 0.9	$ 0.6	$ 2.0	$ 1.1
Defined Benefit Retirement Plans | U.S.
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans			0.8	0.2
Expected employer contribution in full current year	$ 4.6		$ 4.6
Net amortization gain deferral		$ (0.1)		$ (0.2)
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			$ 2.5	$ 2.0
Expected employer contribution in full current year	$ 5.0		5.0
Net amortization gain deferral	(0.1)	$ (0.1)	(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	0.2
Expected employer contribution in full current year	0.4		0.4
Net amortization gain deferral	$ 0.6	$ 0.3	$ 0.9	$ 0.6