Shareholders' Equity (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (7.0)	$ (6.1)	$ (17.9)	$ (17.4)
Tax impact	(13.2)	(16.6)	(43.2)	(48.0)
Total (income), net of tax	(57.5)	(50.8)	(154.1)	(141.3)
Reclassification From Accumulated Other Comprehensive Loss [Member] | Derivative (Loss) Gain [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Tax impact	0.0	0.5	0.7	1.4
Total (income), net of tax	0.0	(1.7)	(2.8)	(4.9)
Reclassification From Accumulated Other Comprehensive Loss [Member] | Derivative (Loss) Gain [Member] | Interest Rate Swap Contracts, Before Tax [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	0.0	(2.2)	(3.5)	(6.3)
Reclassification From Accumulated Other Comprehensive Loss [Member] | Prior Service Credit Amortization [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other non-operating (income), net	(0.1)	(0.1)	(0.2)	(0.2)
Reclassification From Accumulated Other Comprehensive Loss [Member] | Amortization of Net Actuarial Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other non-operating (income), net	0.3	0.3	1.0	1.0
Reclassification From Accumulated Other Comprehensive Loss [Member] | Pension And Postretirement Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total loss, before tax	0.2	0.2	0.8	0.8
Tax impact	0.0	0.0	(0.2)	(0.2)
Total loss, net of tax	0.2	0.2	0.6	0.6
Total reclassifications for the period	$ 0.2	$ (1.5)	$ (2.2)	$ (4.3)