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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 147.1 $ 126.3 $ 432.0 $ 301.5
Other comprehensive income:        
Change in fair value of cash flow swaps (5.0) (29.2) (27.2) (19.8)
Income tax benefit associated with cash flow swaps 1.3 7.3 6.9 5.0
Unrealized gains on available-for-sale debt securities 2.3 9.8 7.6 5.4
Income tax expense associated with available-for-sale debt securities (0.5) (2.0) (1.8) (1.1)
Comprehensive income $ 145.1 $ 112.1 $ 417.4 $ 290.9