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Other, Net (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Other, Net [Abstract]    
Interest income $ 1.7 $ 2.1
AFUDC equity 1.7 1.7
Pension and other postretirement non-service cost 2.7 (2.8)
Miscellaneous (0.7) (1.7)
Other, net $ 5.4 $ (0.7)