Changes in Equity and Accumulated Other Comprehensive Loss (Details of Accumulated Other Comprehensive Income Components) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Tax impact	$ 31.6	$ 27.3
Total reclassifications for the period	3.3
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total before tax	4.5	6.2
Tax impact	1.2	1.3
Total reclassifications for the period	3.3	4.9
Pension
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net loss	4.8	6.5
Prior service costs	0.0	0.0
Postretirement
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net loss	0.0	0.0
Prior service costs	$ (0.3)	$ (0.3)