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Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 167.7 $ 219.5 $ 406.8 $ 555.2
Reclassifications:        
Amortization of unrealized (gain) loss to interest expense 0.1 0.2 0.6 0.7
Total 0.1 0.2 0.6 0.7
Deferred income tax (benefit) expense 0.0 0.1 0.1 0.2
Other comprehensive income (loss) 0.1 0.1 0.5 0.5
Comprehensive income $ 167.8 $ 219.6 $ 407.3 $ 555.7