Accumulated Other Comprehensive Loss (Reclassification Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	$ 5.5	$ 7.8
Tax benefit	35.3	16.2
Total reclassifications for the period, net of tax	(102.4)	(47.3)
Reclassification out of AOCI | Actuarial Losses Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	5.8	8.9
Tax benefit	(1.4)	(2.3)
Total reclassifications for the period, net of tax	$ 4.4	$ 6.6