Derivative Instruments and Hedging Activities (Summary Of Accumulated Other Comprehensive Loss Related To Derivatives) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Net of Tax [Roll Forward]
Stockholders' equity, beginning of period	$ 4,656.8	$ 3,882.6	$ 3,443.8
Stockholders' equity, end of period	3,742.8	4,656.8	3,882.6
Deferred gains and losses on derivatives
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Before Tax [Roll Forward]
Accumulated derivative net gains (losses), beginning of period	(1.3)	(1.0)	(0.5)
Net changes in fair value of derivatives	6.7	(11.5)	(19.7)
Net gains (losses) reclassified from accumulated other comprehensive loss into income	6.3	11.2	19.2
Accumulated derivative net gains (losses), end of period	11.7	(1.3)	(1.0)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Tax [Roll Forward]
Accumulated derivative net gains (losses), beginning of period	(0.5)	(0.1)	(0.1)
Net changes in fair value of derivatives	3.3	(2.6)	(5.1)
Net losses (gains) reclassified from accumulated other comprehensive loss into income	0.0	2.2	5.1
Accumulated derivative net gains (losses), end of period	2.8	(0.5)	(0.1)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Net of Tax [Roll Forward]
Stockholders' equity, beginning of period	(0.8)	(0.9)	(0.4)
Net changes in fair value of derivatives	3.4	(8.9)	(14.6)
Net losses (gains) reclassified from accumulated other comprehensive loss into income	6.3	9.0	14.1
Stockholders' equity, end of period	8.9	(0.8)	(0.9)
Deferred gains and losses on derivatives | Foreign Currency Contracts:
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Before Tax [Roll Forward]
Net changes in fair value of derivatives	(1.2)	(11.8)	(15.0)
Net gains (losses) reclassified from accumulated other comprehensive loss into income	6.7	11.1	14.5
Accumulated derivative net gains (losses), end of period	(2.0)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Tax [Roll Forward]
Net changes in fair value of derivatives	1.2	(2.7)	(3.9)
Net losses (gains) reclassified from accumulated other comprehensive loss into income	0.3	2.2	3.9
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Net of Tax [Roll Forward]
Net changes in fair value of derivatives	(2.4)	(9.1)	(11.1)
Net losses (gains) reclassified from accumulated other comprehensive loss into income	6.4	8.9	10.6
Deferred gains and losses on derivatives | Commodity contracts
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Before Tax [Roll Forward]
Net changes in fair value of derivatives	(0.3)	0.3	(4.7)
Net gains (losses) reclassified from accumulated other comprehensive loss into income	0.3	0.1	4.7
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Tax [Roll Forward]
Net changes in fair value of derivatives	0.0	0.1	(1.2)
Net losses (gains) reclassified from accumulated other comprehensive loss into income	0.0	0.0	1.2
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Net of Tax [Roll Forward]
Net changes in fair value of derivatives	(0.3)	0.2	(3.5)
Net losses (gains) reclassified from accumulated other comprehensive loss into income	0.3	$ 0.1	$ 3.5
Deferred gains and losses on derivatives | Treasury Rate Locks
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Before Tax [Roll Forward]
Net changes in fair value of derivatives	8.2
Net gains (losses) reclassified from accumulated other comprehensive loss into income	(0.7)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Tax [Roll Forward]
Net changes in fair value of derivatives	2.1
Net losses (gains) reclassified from accumulated other comprehensive loss into income	(0.3)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges in Period, Net of Tax [Roll Forward]
Net changes in fair value of derivatives	6.1
Net losses (gains) reclassified from accumulated other comprehensive loss into income	$ (0.4)