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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt, Interest Income, Expense and Other Finance Costs [Abstract]
Interest income	$ 1.5	$ 1.3	$ 2.6	$ 1.9
Interest expense and other financing costs	(21.7)	(19.2)	(42.2)	(36.1)
Interest income (expense) and other financing costs, net	$ (20.2)	$ (17.9)	$ (39.6)	$ (34.2)

X

- 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section S99
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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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