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Debt - Components of Interest Expense and Effective Interest Rates of Senior Convertible Notes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash interest expense
Contractual coupon interest	$ 2.3	$ 2.3
Non-cash interest expense
Accretion of debt discount	11.8	11.3
Amortization of debt issuance costs	0.9	0.9
Total interest expense recognized on senior notes	$ 15.0	$ 14.5
0.75% Senior Convertible Notes due 2022
Non-cash interest expense
Effective interest rate (as a percent)	5.10%	5.10%
0.75% Senior Convertible Notes due 2023
Non-cash interest expense
Effective interest rate (as a percent)	5.60%	5.60%

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- Definition

Cash Interest Expense [Abstract]

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Non-Cash Interest Expense [Abstract]

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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