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Income Taxes - Textual (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |
Provision for income tax expense | $ 29.3 | $ 28.6 | $ 59.3 | $ 68.3 |
Net deferred tax assets | 75.4 |  | 75.4 |  |
Valuation allowance | 36.7 |  | 36.7 |  |
Additional tax benefits due to approval of accounting method change |  |  |  |  | $ 51.3
Gross unrecognized tax benefits | 1.1 |  | 1.1 |  | 0.3
Gross unrecognized tax benefits that would impact effective tax rate if recognized | 1.1 |  | 1.1 |  | $ 0.3
Amount of decrease in unrecognized tax benefit to be released | 0.5 |  | 0.5 |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating Loss Carryforwards | $ 73.7 |  | $ 73.7 |  |

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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 Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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