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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt, Interest Income, Expense and Other Finance Costs [Abstract]
Interest income	$ 0.7	$ 1.6	$ 2.3	$ 4.3
Interest expense and other financing costs	(9.4)	(21.2)	(36.3)	(63.3)
Interest income (expense) and other financing costs, net	$ (8.7)	$ (19.5)	$ (34.1)	$ (59.1)

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
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-Name Accounting Standards Codification
-Topic 220
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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