Income Taxes (Details) - USD ($) $ in Millions  | 
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2019  | 
Jun. 30, 2018  | 
Jun. 30, 2019  | 
Jun. 30, 2018  | 
Dec. 31, 2018  | 
|
| Income Tax Disclosure [Abstract] | |||||
| Provision (benefit) for income taxes, as a percentage of income before income taxes | 45.70% | 116.40% | 43.90% | 86.50% | |
| Liability related to unrecognized tax benefits | $ 2.2 | $ 2.2 | $ 2.2 | ||
| X | ||||||||||
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
- References No definition available. 
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| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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