Other, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other, Net [Abstract]
Interest income	$ 1.8	$ 0.6	$ 3.6	$ 1.5
AFUDC equity	4.4	4.0	9.2	7.0
Pension and other postretirement non-service benefit (cost)	(4.9)	4.7	(8.4)	12.3
Miscellaneous	0.7	(0.3)	(0.9)	(0.9)
Other, net	$ 2.0	$ 9.0	$ 3.5	$ 19.9