Accumulated Other Comprehensive Loss (Reclassification Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	$ 5.5		$ 7.3		$ 11.0	$ 15.1
Tax benefit	44.1		27.6		79.4	43.8
Total reclassifications for the period, net of tax	(127.8)	$ (102.4)	(80.3)	$ (47.3)	(230.2)	(127.6)
Reclassification out of AOCI | Actuarial Losses Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-operating expenses	5.9		8.4		11.7	17.3
Tax benefit	(1.6)		(2.2)		(3.0)	(4.5)
Total reclassifications for the period, net of tax	$ 4.3		$ 6.2		$ 8.7	$ 12.8