Stock-Based Compensation Plans - Summary of Unrecognized Stock-based Compensation Expense (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 27.8
Weighted Average Remaining Vesting Period (Years)	3 years 1 month 20 days
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 3.3
Weighted Average Remaining Vesting Period (Years)	1 year 5 months 19 days
Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 7.8
Weighted Average Remaining Vesting Period (Years)	3 years 4 months 17 days
Performance Share Units (PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 16.7
Weighted Average Remaining Vesting Period (Years)	3 years 4 months 9 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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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