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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]    
Net income $ 107.5 $ 385.9
Other comprehensive income:    
Unrealized gain on available for sale securities 0.2 0.4
Net gain on pension and other post-retirement benefits 0.3 0.0
Total other comprehensive income 0.5 0.4
Comprehensive income 108.0 386.3
Less: comprehensive income attributable to noncontrolling interest 0.9 3.8
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 107.1 $ 382.5