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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt, Interest Income, Expense and Other Finance Costs [Abstract]
Interest income	$ 1.6	$ 0.8	$ 4.3	$ 2.7
Interest expense and other financing costs	(21.2)	(19.1)	(63.3)	(55.1)
Interest income (expense) and other financing costs, net	$ (19.5)	$ (18.3)	$ (59.1)	$ (52.5)

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)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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-SubTopic 30
-Section 45
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-Publisher FASB
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-Topic 280
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-Paragraph 22
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-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
-Section S99
-Paragraph 2
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