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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt, Interest Income, Expense and Other Finance Costs [Abstract]
Interest income	$ 1.4	$ 0.7	$ 3.7	$ 1.6
Interest expense and other financing costs	(11.4)	(10.7)	(22.5)	(26.9)
Interest income (expense) and other financing costs, net	$ (10.0)	$ (10.0)	$ (18.7)	$ (25.3)

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- Definition

Debt, Interest Income, Expense and Other Finance Costs [Abstract]

+ References

No definition available.

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- Definition

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

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- Definition

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

+ References

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

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