Accumulated Other Comprehensive Loss (Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	$ 58.5	$ 23.7	$ 30.6
Tax benefit	44.2	55.0	35.4
Total reclassifications for the period, net of tax	(122.1)	(144.9)	$ (143.7)
Non-cash pension settlement charge	27.7
Reclassification out of AOCI | Actuarial Losses Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	58.6	19.4
Tax benefit	(15.1)	(5.0)
Total reclassifications for the period, net of tax	$ 43.5	$ 14.4