Benefit Plans, Reconciliation of Changes in Fair Value Measurement of Plan Assets Using Significant Unobservable Inputs (Details) - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of changes in fair value measurement of plan assets [Roll Forward]
Beginning balance	$ 21.0	$ 20.0
Purchases, sales, settlements	0.0	0.0
Actual return on plan assets still held at reporting date	(12.8)	0.9
Foreign exchange impact	0.1	0.1
Ending balance	8.3	21.0
Fair Value Transfers [Abstract]
Fair value, assets, Level 3 transfers in, amount	0.0	0.0
Fair value, assets, Level 3 transfers out, amount	$ 0.0	$ 0.0