Benefit Plans - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
U.S. Plans
Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligations	$ 425.2	$ 1.0
Accumulated benefit obligation	415.9	1.0
Fair value of plan assets	331.0	0.0
Accumulated benefit obligation	478.0	59.8
Non-U.S. Plans
Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligations	441.4	330.1
Accumulated benefit obligation	406.3	325.3
Fair value of plan assets	260.5	235.3
Accumulated benefit obligation	$ 426.7	$ 339.1