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Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Debt Instrument
Interest accretion of convertible notes discount			$ 7.3	$ 10.0
Financing costs amortization	$ 0.3	$ 0.3	1.0	1.0
Convertible Debt | Convertible Notes, due 2024
Debt Instrument
Interest accretion of convertible notes discount	1.9		5.4
Debt instrument, interest expense	0.6		1.9
Interest expense	2.5		7.3
Financing costs amortization	0.2		0.5
Convertible Debt | Convertible Notes, Due 2018
Debt Instrument
Interest accretion of convertible notes discount	0.4	3.4	1.9	10.0
Debt instrument, interest expense	0.1	1.3	1.0	3.8
Interest expense	0.5	4.7	2.9	13.8
Financing costs amortization	$ 0.0	$ 0.2	$ 0.1	$ 0.6

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Amount of amortization expense attributable to debt issuance costs.

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

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