Benefit Plans Benefit Plans - Future Benefit Payments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Amount of net loss (gain)	$ 0.0
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
2018, gross	0.9
2019, gross	0.9
2020, gross	0.8
2021, gross	0.8
2022, gross	0.8
2023-2027, gross	3.1
2018, net	0.8
2019, net	0.8
2020, net	0.8
2021, net	0.7
2022, net	0.7
2023-2027, net	2.8
U.S. Plans | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amount of net loss (gain)	5.0
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
2018	28.4
2019	29.1
2020	29.8
2021	30.4
2022	30.9
2023-2027	160.4
Foreign Plan [Member] | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amount of net loss (gain)	(1.5)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
2018	30.8
2019	27.9
2020	27.9
2021	25.1
2022	31.7
2023-2027	$ 132.9