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Other, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Other, Net (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other, Net [Abstract]
Interest income	$ 1.1	$ 1.3	$ 2.7	$ 4.4
AFUDC equity	3.5	1.8	8.4	4.9
Pension and other postretirement non-service benefit	9.3	0.6	26.4	6.4
Sale of emission reduction credits	0.0	4.6	0.0	4.6
Miscellaneous	0.4	(0.3)	(0.3)	(0.4)
Other, net	$ 14.3	$ 8.0	$ 37.2	$ 19.9