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Income Taxes - (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
U.S. federal statutory tax rate (as a percent) |  |  |  |  |  |  | 21.00% | 35.00%
Effective income tax rate (as a percent) | 26.80% | 465.00% |  | 23.00% | 231.40% |  |  |
Effective income tax rate excluding certain discrete tax items (as a percent) | 28.30% |  | 28.00% | 28.20% |  | 28.20% |  |
Tax Cuts and Jobs Act of 2017, provisional net charge |  |  |  | $ 56.0 |  |  |  |
Tax Cuts and Jobs Act of 2017, provisional net charge (USD/Share) |  |  |  | $ 2.96 |  |  |  |
ASU 2016-09 |  |  |  |  |  |  |  |
Excess tax benefits from employee stock compensation benefit | $ 0.4 |  |  | $ 1.9 |  |  |  |

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- Definition Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Per share amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109245112&loc=d3e23594-113945 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109245112&loc=d3e23586-113945 + Details
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