Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax (benefit) provision of changes in pension and post-retirement plan assets and benefit obligations recorded to AOCI	$ (13.5)	$ (12.6)	$ (7.1)
Unrealized tax asset on related tax loss	118.3	115.2
Valuation allowance against U.S. and non-U.S. deferred tax assets	35.1	34.8
Total valuation allowance	153.4	150.0
Increase in total amount of unrecognized tax benefits that would impact effective tax rate	32.6	43.8	43.1
Interest expense and penalties, related to unrecognized tax benefits	(0.5)	0.8	$ 0.7
Unrecognized tax benefits, income tax penalties and interest accrued	7.5	$ 8.0
Change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit	10.6
Undistributed Earnings of Foreign Subsidiaries	303.8
Undistributed Foreign Earnings, Not Permanently Reinvested	1,392.7
Undistributed Foreign Earnings, Not Permanently Reinvested, Tax	$ 11.1