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Other, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Other, Net [Abstract]        
Interest income $ 2.7 $ 2.1 $ 6.3 $ 3.6
AFUDC equity 6.0 4.0 15.2 11.0
Pension and other postretirement non-service benefit (cost) (9.8) 5.3 (18.2) 17.6
Miscellaneous (0.5) (1.3) (1.4) (2.2)
Other, net $ (1.6) $ 10.1 $ 1.9 $ 30.0