Benefit Plans Benefit Plans - Accumulated Benefit Obligation In Excess of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 319.2	$ 315.6
Accumulated benefit obligation	297.5	295.2
Fair value of plan assets	90.5	80.2
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	610.4	570.0
Accumulated benefit obligation	610.4	570.0
Fair value of plan assets	$ 474.0	$ 416.2