Accumulated Other Comprehensive Loss (Reclassification Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	$ 21.3			$ 24.5			$ 32.3	$ 39.6
Tax benefit	43.7			24.4			123.1	68.2
Total reclassifications for the period, net of tax	(126.3)	$ (127.8)	$ (102.4)	(74.5)	$ (80.3)	$ (47.3)	(356.5)	(202.1)
Non-cash pension settlement charge	15.9			16.7			15.9	16.7
Reclassification out of AOCI | Actuarial Losses Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	21.7			25.3			33.4	42.6
Tax benefit	(5.6)			(6.5)			(8.6)	(11.0)
Total reclassifications for the period, net of tax	$ 16.1			$ 18.8			$ 24.8	$ 31.6