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Debt, Interest Income, Expense and Other Finance Costs - Interest Income, Expense and Other Financing Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt, Interest Income, Expense and Other Finance Costs [Abstract]
Interest income	$ 3.6	$ 6.2	$ 3.9
Interest expense and other financing costs	(48.6)	(80.0)	(74.8)
Interest expense and other financing costs, net	$ (44.9)	$ (73.9)	$ (71.0)

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- Definition

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

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

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