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Long-Term Debt - Summary of Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Long-term debt
Debt issuance costs, net	$ (16.1)	$ (16.6)
Total long-term debt	2,205.2	2,204.6
3.15% Senior notes due August 1, 2027
Long-term debt
Senior notes	425.0	425.0
Less: Discount	(0.1)	(0.1)
2.3% Senior notes due December 15, 2031
Long-term debt
Senior notes	400.0	400.0
Less: Discount	(0.6)	(0.6)
5.6% Senior notes due November 15, 2032
Long-term debt
Senior notes	500.0	500.0
Less: Discount	(0.7)	(0.8)
3.95% Senior notes due August 1, 2047
Long-term debt
Senior notes	400.0	400.0
Less: Discount	(2.2)	(2.2)
5.0% Senior notes due June 15, 2052
Long-term debt
Senior notes	500.0	500.0
Less: Discount	$ (0.1)	$ (0.1)

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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