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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net income $ 132.1 $ 147.1
Other comprehensive income:    
Change in fair value of cash flow swaps (13.7) 10.0
Income tax benefit (expense) associated with cash flow swaps 3.5 (2.5)
Unrealized gains (losses) on available-for-sale debt securities 3.9 (2.8)
Income tax (expense) benefit associated with available-for-sale debt securities (0.9) 0.6
Comprehensive income $ 124.9 $ 152.4