Stock-Based Compensation Plans - Summary of Unrecognized Stock-based Compensation Expense (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 24.9
Weighted Average Remaining Vesting Period (Years)	2 years 5 months 26 days
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 0.8
Weighted Average Remaining Vesting Period (Years)	1 year 7 days
Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 9.9
Weighted Average Remaining Vesting Period (Years)	2 years 3 months 14 days
Performance Share Units (PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 14.2
Weighted Average Remaining Vesting Period (Years)	2 years 8 months 19 days

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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