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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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Disclosure [Abstract]
Interest income	$ 2.4	$ 1.3	$ 4.0	$ 3.8
Interest expense and other financing costs	(34.9)	(27.8)	(70.7)	(44.6)
Interest expense and other financing costs, net	$ (32.5)	$ (26.5)	$ (66.8)	$ (40.9)

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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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