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Other, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other, Net [Abstract]        
Interest income $ 0.7 $ 1.4 $ 1.6 $ 3.1
AFUDC equity 3.4 1.4 4.9 3.1
Pension and other postretirement non-service benefit 8.6 3.1 17.1 5.8
Miscellaneous (0.3) 0.6 (0.7) (0.1)
Other, net $ 12.4 $ 6.5 $ 22.9 $ 11.9