Stock-Based Compensation - Stock Option and RSU Narrative (Details) $ in Millions	6 Months Ended
Jun. 30, 2020 USD ($) shares
Stock-based compensation
Total compensation cost of options granted but not yet vested \| $	$ 21.4
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	141,298
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)	140,747
Stock-based compensation expense related to nonvested awards \| $	$ 10.7
RSUs Vested Not Yet Released	603,931
Stock Options
Stock-based compensation
Weighted average remaining periods over which unrecognized amounts are expected to be recognized	3 years

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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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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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