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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Tax cuts and jobs act of 2017, provisional income tax benefit | $ 10.0 |  |
Tax cuts and jobs act of 2017, provisional benefit, change in tax rate | 16.0 |  |
Tax cuts and jobs act of 2017, provisional income tax expense, transition tax for accumulated foreign earnings | 7.0 |  |
Accumulated foreign earnings | 101.0 | $ 101.0 |
Tax cuts and jobs act of 2017, provision income tax benefit, current year cash dividends | 1.0 |  |
Current and prior year undistributed earnings of subsidiaries operating outside the U.S | 151.0 | 151.0 |
Deferred tax assets, investment in joint venture | 5.3 | 5.3 | $ 0.0
Valuation allowance increase |  | 0.8 |
Credit carryforwards | 3.0 | 3.0 |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 12.0 | 12.0 |
Amount that would affect effective tax rate | 3.0 | 3.0 | $ 2.0
Accrued interest and penalties on unrecognized tax benefits | 1.0 | 1.0 |
Expiring tax credit carryforwards |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 7.0 | $ 7.0 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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