Accumulated Other Comprehensive Loss (Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Non-operating expenses	$ 23.7	$ 30.6	$ 24.8
Tax (benefit) expense	55.0	35.4	95.6
Total reclassifications for the period, net of tax	(144.9)	(143.7)	(71.9)
AOCI Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total reclassifications for the period, net of tax
Reclassification out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Non-operating expenses	19.4	25.7
Tax (benefit) expense	(5.0)	(6.6)
Total reclassifications for the period, net of tax	14.4	19.1
Reclassification out of AOCI | Actuarial Losses Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Non-operating expenses	19.4	27.4
Tax (benefit) expense	(5.0)	(7.0)
Total reclassifications for the period, net of tax	$ 14.4	20.4
Reclassification out of AOCI | Prior Service Costs Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Non-operating expenses		(1.7)
Tax (benefit) expense		0.4
Total reclassifications for the period, net of tax		$ (1.3)