Accumulated Other Comprehensive Loss (Reclassification Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses, net	$ 8.0	$ 44.3	$ 59.5
Tax benefit	164.9	155.8	87.9
Total reclassifications for the period, net of tax	(464.4)	(453.7)	(263.0)
Non-cash pension settlement charge		27.0	$ 30.4
Reclassification out of AOCI [Member] | Actuarial Losses Recognized [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses, net	1.1	45.0
Tax benefit	(0.3)	(11.6)
Total reclassifications for the period, net of tax	$ 0.8	$ 33.4