CONDENSED CONSOLIDATED BALANCE SHEETS - I&M (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Long-term Debt Due Within One Year	$ 4,178.9	$ 3,335.0
Common Stock – Shares Authorized (in shares)	600,000,000	600,000,000
I&M
Long-term Debt Due Within One Year	$ 254.3	$ 269.2
Common Stock – Shares Authorized (in shares)	2,500,000	2,500,000
Common Stock – Shares Outstanding (in shares)	1,400,000	1,400,000
I&M | DCC Fuel
Long-term Debt Due Within One Year	$ 64.3	$ 79.0