Benefit Plans Benefit Plans - Accumulated Benefit Obligation In Excess of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 426.5	$ 452.0
Accumulated benefit obligation	409.7	439.5
Fair value of plan assets	340.9	359.5
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	522.2	569.0
Accumulated benefit obligation	522.2	569.0
Fair value of plan assets	$ 346.0	$ 378.7