Accumulated Other Comprehensive Loss (Reclassification Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses, net	$ 0.4	$ 2.8
Tax benefit	36.8	43.9
Total reclassifications for the period, net of tax	(105.5)	(125.0)
Reclassification out of AOCI [Member] | Actuarial Losses Recognized [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses, net	1.5	0.3
Tax benefit	(0.4)	(0.1)
Total reclassifications for the period, net of tax	$ 1.1	$ 0.2