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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Total $ 1,602.0  
Recorded Amount    
Derivative [Line Items]    
Variable rate debt 302.0 $ 866.3
Fixed rate debt 1,300.0 1,300.0
Total 1,602.0 2,166.3
Fair Value    
Derivative [Line Items]    
Variable rate debt 302.0 866.3
Fixed rate debt 1,293.6 1,251.8
Total $ 1,595.6 $ 2,118.1