Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Accounting Policies [Abstract] | |||
| Total effect of income tax reform | $ 31.0 | ||
| Unrecognized tax benefits | $ 0.0 | $ 0.0 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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