Shareholders' Equity (Reclassification Out of Accumulated Other Comprehensive Income) (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 [Line Items]
Interest expense	$ (5.8)	$ (5.6)	$ (10.9)	$ (11.3)
Tax impact	(15.0)	(19.2)	(30.0)	(31.4)
Total (income), net of tax	(52.2)	(55.1)	(96.6)	(90.5)
Reclassification From Accumulated Other Comprehensive Loss [Member] | Derivative (Loss) Gain [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Tax impact	0.3	0.5	0.7	0.9
Total (income), net of tax	(1.1)	(1.7)	(2.8)	(3.2)
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	(1.4)	(2.2)	(3.5)	(4.1)
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	0.0	0.0	(0.1)	(0.1)
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	0.4	0.3	0.7	0.7
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	0.4	0.3	0.6	0.6
Tax impact	(0.1)	(0.1)	(0.2)	(0.2)
Total loss, net of tax	0.3	0.2	0.4	0.4
Total reclassifications for the period	$ (0.8)	$ (1.5)	$ (2.4)	$ (2.8)