Stock-Based Compensation Plans - Stock Options Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested options	$ 21.3
Unrecognized compensation cost related to unvested options, weighted-average period of recognition	3 years 10 months 17 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage per year	25.00%
Vesting period	4 years
Contractual term	10
Compensation expense for stock options	$ 0.7
Tax benefit	$ 0.0

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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