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Derivative Instruments and Hedging Activities (Summary Of Accumulated Other Comprehensive Loss Related To Derivatives) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
After-Tax Amount      
Stockholders' equity, beginning of period $ 3,882.6 $ 3,443.8 $ 3,018.0
Stockholders' equity, end of period 4,656.8 3,882.6 3,443.8
Deferred gains and losses on derivatives      
Before-Tax Amount      
Accumulated derivative net gains (losses), beginning of period (1.0) (0.5) (3.0)
Net changes in fair value of derivatives (11.5) (19.7) 8.3
Net losses (gains) reclassified from accumulated other comprehensive loss into income 11.2 19.2 (5.8)
Accumulated derivative net gains (losses), end of period (1.3) (1.0) (0.5)
Income Tax      
Accumulated derivative net gains (losses), beginning of period (0.1) (0.1) (0.5)
Net changes in fair value of derivatives (2.6) (5.1) 3.2
Net losses (gains) reclassified from accumulated other comprehensive loss into income 2.2 5.1 (2.8)
Accumulated derivative net gains (losses), end of period (0.5) (0.1) (0.1)
After-Tax Amount      
Stockholders' equity, beginning of period (0.9) (0.4) (2.5)
Net changes in fair value of derivatives (8.9) (14.6) 5.1
Net losses (gains) reclassified from accumulated other comprehensive loss into income 9.0 14.1 (3.0)
Stockholders' equity, end of period (0.8) $ (0.9) $ (0.4)
Deferred gains and losses on derivatives | Foreign currency contracts      
Before-Tax Amount      
Accumulated derivative net gains (losses), end of period $ (1.4)