Derivative Instruments and Hedging Activities (Summary Of Accumulated Other Comprehensive Loss Related To Derivatives) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
After-Tax Amount
Stockholders' equity, beginning of period	$ 3,443.8	$ 3,018.0	$ 2,907.0
Stockholders' equity, end of period	3,882.6	3,443.8	3,018.0
Deferred Net (Losses) Gains on Derivatives
Before-Tax Amount
Accumulated derivative net gains (losses), beginning of period	(0.5)	(3.0)	(1.5)
Net changes in fair value of derivatives	(19.7)	8.3	4.9
Net losses (gains) reclassified from accumulated other comprehensive loss into income	19.2	(5.8)	(6.4)
Accumulated derivative net gains (losses), end of period	(1.0)	(0.5)	(3.0)
Income Tax
Accumulated derivative net gains (losses), beginning of period	(0.1)	(0.5)	(0.2)
Net changes in fair value of derivatives	(5.1)	3.2	(0.2)
Net losses (gains) reclassified from accumulated other comprehensive loss into income	5.1	(2.8)	(0.1)
Accumulated derivative net gains (losses), end of period	(0.1)	(0.1)	(0.5)
After-Tax Amount
Stockholders' equity, beginning of period	(0.4)	(2.5)	(1.3)
Net changes in fair value of derivatives	(14.6)	5.1	5.1
Net losses (gains) reclassified from accumulated other comprehensive loss into income	14.1	(3.0)	(6.3)
Stockholders' equity, end of period	(0.9)	$ (0.4)	$ (2.5)
Deferred Net (Losses) Gains on Derivatives | Foreign currency contracts
Before-Tax Amount
Accumulated derivative net gains (losses), end of period	(0.6)
Deferred Net (Losses) Gains on Derivatives | Commodity contracts
Before-Tax Amount
Accumulated derivative net gains (losses), end of period	$ (0.4)