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Income Taxes - Textual (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |
Provision for income tax expense | $ 23.5 | $ 29.3 | $ 54.3 | $ 59.3 |  |
Document Period End Date |  |  | Jun. 30, 2019 |  |  |
Net deferred tax assets | 42.6 |  | $ 42.6 |  |  |
Valuation allowance | 34.3 |  | 34.3 |  |  |
Additional tax benefits due to approval of accounting method change |  |  |  |  | $ 51.3 |
Gross unrecognized tax benefits | 0.6 |  | 0.6 |  |  | $ 0.9
Unrecognized tax benefits which would affect our effective tax rate if recognized | 0.6 |  | 0.6 |  |  | $ 0.9
Amount of decrease in unrecognized tax benefit to be released | 0.2 |  | 0.2 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards | $ 62.8 |  | $ 62.8 |  |  |

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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 of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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