Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Time-based restricted stock unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based Compensation Expense	$ 0.8	$ 0.0
Associated tax benefit from stock-based compensation expense		0.0
Unrecognized compensation expense	$ 4.5
Period for unrecognized compensation expense expected to be recognized	3 years 2 months 12 days
Time-based stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based Compensation Expense	$ 0.1	0.0
Unrecognized compensation expense	$ 2.9
Period for unrecognized compensation expense expected to be recognized	3 years 7 months 28 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Associated tax benefit from stock-based compensation expense	$ 0.1	$ 0.1
Maximum \| Time-based restricted stock unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Associated tax benefit from stock-based compensation expense	$ 0.2

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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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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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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