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Debt - Schedule of Interest Expense (Details) - Senior Notes - 5.50% convertible senior notes due 2021 - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Contractual interest coupon	$ 3.0	$ 2.9	$ 5.9	$ 5.9
Amortization of debt discount	1.6	1.5	3.2	2.9
Amortization of debt issuance costs	0.3	0.3	0.6	0.6
Total	$ 4.9	$ 4.7	$ 9.7	$ 9.4

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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.

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

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