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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Derivative [Line Items]    
Total $ 1,873.8  
Recorded Amount    
Derivative [Line Items]    
Variable rate debt 573.8 $ 288.8
Fixed rate debt 1,300.0 800.0
Total 1,873.8 1,088.8
Fair Value    
Derivative [Line Items]    
Variable rate debt 573.8 288.8
Fixed rate debt 1,182.2 717.7
Total $ 1,756.0 $ 1,006.5