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Debt, Interest Income, Expense, and Other Finance Costs - Interest Income (Expense), and Other Financing Costs, net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Disclosure [Abstract]
Interest income	$ 3.0	$ 0.8	$ 7.0	$ 4.6
Interest expense and other financing costs	(31.6)	(34.7)	(102.3)	(79.4)
Interest expense and other financing costs, net	$ (28.6)	$ (34.0)	$ (95.4)	$ (74.8)

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Represents the amount of interest income and expense, net, which includes other financing costs.

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