Stock-Based Compensation - Stock Option and RSU Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) shares
Stock-based compensation
Total compensation cost of options granted but not yet vested \| $	$ 22.4
PSUs
Stock-based compensation
Grants in Period (shares)	51,839
PSU's reserved for issuance (in shares)	51,839
Accumulated performance stock units, reserved in case actual results exceed target levels	141,859
Restricted stock units
Stock-based compensation
Weighted average remaining periods over which unrecognized amounts are expected to be recognized	2 years
Grants in Period (shares)	77,214
Stock-based compensation expense related to nonvested awards \| $	$ 9.9
RSUs Vested Not Yet Released	588,359
Stock Options
Stock-based compensation
Weighted average remaining periods over which unrecognized amounts are expected to be recognized	3 years

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Performance Stock Units, Shares Reserved for Future Issuance

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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