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Other, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Other, Net [Abstract]        
Interest income $ 2.1 $ 1.1 $ 3.6 $ 2.7
AFUDC equity 4.0 3.5 11.0 8.4
Pension and other postretirement non-service benefit 5.3 9.3 17.6 26.4
Miscellaneous (1.3) 0.4 (2.2) (0.3)
Other, net $ 10.1 $ 14.3 $ 30.0 $ 37.2