Retirement and Other Postretirement Benefit Plans - Schedule of Amounts Recognized on Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Defined Benefit Retirement Plans | U.S.
Amounts recognized on the balance sheet:
Accrued liabilities	$ 1.0	$ 4.5
Other non-current liabilities	17.8	16.9
Total accrued benefit	$ 18.8	$ 21.4
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:
Noncurrent asset	$ 38.8	$ 32.2
Accrued liabilities	1.0	0.3
Other non-current liabilities	21.0	19.6
Total accrued benefit	22.0	19.9
Postretirement Health Care and Life Insurance Benefit Plans
Amounts recognized on the balance sheet:
Accrued liabilities	0.5	0.5
Other non-current liabilities	3.9	3.6
Total accrued benefit	$ 4.4	$ 4.1