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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |
Change in tax rate income tax expense (benefit) | $ 56.9 |  |  |
Transition tax for accumulated foreign earnings, income tax expense (benefit) | 0.8 |  |  |
Non-deductible officer's compensation provisional income tax expense | 5.6 |  |  |
Tax depreciation provisional income tax benefit | 19.7 |  |  |
Unrecognized tax benefits | $ 2.9 | $ 2.8 | $ 2.3 | $ 1.8
Interest |  | 0.1 |  |
Unrecognized tax benefits that would impact effective tax rate |  | 2.7 |  |
Anticipated decrease in unrecognized tax positions |  | 0.5 |  |
Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards |  | 4.6 |  |
State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards |  | 1.2 |  |
Operating loss carryforwards, valuation allowance |  | $ 0.2 |  |

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- Definition Tax Cuts And Jobs Act Of 2017, Transition Tax For Accumulated Foreign Earnings, Income Tax Expense (Benefit) + References No definition available. + Details
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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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