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Other, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Other, Net [Abstract]        
Interest income $ 0.6 $ 0.7 $ 1.5 $ 1.6
AFUDC equity 4.0 3.4 7.0 4.9
Pension and other postretirement non-service benefit 4.7 8.6 12.3 17.1
Miscellaneous (0.3) (0.3) (0.9) (0.7)
Other, net $ 9.0 $ 12.4 $ 19.9 $ 22.9