Accumulated Other Comprehensive Loss (Reclassification Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	$ 2.8	$ 5.5
Tax benefit	43.9	35.3
Total reclassifications for the period, net of tax	(125.0)	(102.4)
Reclassification out of AOCI | Actuarial Losses Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	0.3	5.8
Tax benefit	(0.1)	(1.4)
Total reclassifications for the period, net of tax	$ 0.2	$ 4.4