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Debt - Schedule of Interest Expense (Details) - Senior Notes - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Senior Secured Notes due 2022
Debt Instrument [Line Items]
Contractual interest coupon	$ 47.3	$ 33.2	$ 0.0
Amortization of debt discount	2.4	1.7	0.0
Total	49.7	34.9	0.0
Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Contractual interest coupon	11.8	11.8	9.2
Amortization of debt discount	6.6	6.0	4.3
Amortization of debt issuance costs	1.2	1.2	1.0
Total	$ 19.6	$ 19.0	$ 14.5

X

- 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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