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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Debt Disclosure [Abstract]
Interest income	$ 2.6	$ 2.6	$ 3.9	$ 6.3
Interest expense and other financing costs	(33.2)	(28.2)	(60.8)	(54.8)
Interest expense and other financing costs, net	$ (30.6)	$ (25.7)	$ (56.9)	$ (48.5)

Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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+ Details