Benefit Plans Benefit Plans - Future Benefit Payments (Details) $ in Millions	Dec. 31, 2019 USD ($)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Amount of net loss (gain)	$ 0.6
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
2018, gross	1.0
2019, gross	1.0
2020, gross	1.0
2021, gross	1.0
2022, gross	1.0
2023-2027, gross	4.7
2018, net	0.9
2019, net	0.9
2020, net	0.9
2021, net	0.9
2022, net	0.9
2023-2027, net	4.5
U.S. Plans | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amount of net loss (gain)	7.7
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
2018	29.0
2019	30.0
2020	30.3
2021	30.8
2022	31.3
2023-2027	161.7
Foreign Plan [Member] | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amount of net loss (gain)	(0.6)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
2018	20.1
2019	20.9
2020	21.4
2021	24.6
2022	24.2
2023-2027	$ 125.4