Other Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Non-service components of net periodic benefit costs	Other income, net	Other income, net	Other income, net
Non-service components of net periodic benefit costs	$ 104.4	$ 72.2	$ 41.2
AFUDC - Equity	29.4	18.0	20.9
Gains (losses) from investments held in rabbi trust	(12.6)	18.6	12.7
Other, net	(1.7)	4.5	2.3
Other income, net	128.8	133.2	79.5
Other
Equity earnings of subsidiaries	$ 9.3	$ 19.9	$ 2.4