Changes in Equity and Accumulated Other Comprehensive Loss (Details of Accumulated Other Comprehensive Income Components) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Tax impact	$ 98.9	$ 5.0	$ 133.6	$ 33.8
Total reclassifications for the period			6.8
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total before tax	4.5	6.1	9.0	12.5
Tax impact	1.0	1.1	2.2	2.4
Total reclassifications for the period	3.5	5.0	6.8	10.1
Pension
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Prior service costs	0.0	(0.1)	0.0	(0.1)
Net loss	4.8	6.5	9.5	13.1
Postretirement
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Prior service costs	(0.3)	(0.3)	(0.5)	(0.5)
Net loss	$ 0.0	$ 0.0	$ 0.0	$ 0.0