Retirement and Other Postretirement Benefit Plans - Schedule of Amounts Recognized on Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Amounts recognized on the balance sheet:
Other non-current liabilities	$ 41.9	$ 42.0
Defined Benefit Retirement Plans | U.S.
Amounts recognized on the balance sheet:
Accrued liabilities	0.9	0.9
Other non-current liabilities	18.0	17.2
Total accrued benefit	$ 18.9	$ 18.1
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:
Other assets	$ 47.1	$ 42.6
Accrued liabilities	0.3	0.4
Other non-current liabilities	18.1	18.8
Total accrued benefit	18.4	19.2
Postretirement Health Care and Life Insurance Benefit Plans
Amounts recognized on the balance sheet:
Accrued liabilities	0.5	0.5
Other non-current liabilities	2.7	2.8
Total accrued benefit	$ 3.2	$ 3.3