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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Reasonable estimate of income tax expense |  |  | $ 35.8 |  |
Provisional income tax expense (benefit) |  |  | (64.7) |  |
Tax benefit attributable to income taxes payable and deferred tax assets (liabilities) |  |  | (14.5) |  |
Transition tax expense (benefit) |  |  | 115.0 |  |
Transition tax as a result of Tax Cuts and Jobs Act, liability, noncurrent | $ 95.0 |  | $ 95.0 |  |
Effective income tax rate | 37.11% | 34.87% | 34.71% | 35.09% |
Effective tax rates, net tax expense (benefit) |  |  | $ (79.2) |  |
Excess tax benefits of equity-based compensation and tax law changes in foreign jurisdictions | $ 8.1 |  | 14.8 |  |
Unrecognized tax benefits | 16.2 |  | 16.2 |  |
Liability recorded for interest and penalties related to unrecognized tax benefits | $ 11.5 |  | $ 11.5 |  |
Scenario, Forecast |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Blended statutory tax rate |  |  |  |  | 28.00%

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- Definition Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax asset (liability) from change in tax rate pursuant to 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 Amount of income tax expense (benefit) for which accounting for tax effect is incomplete for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 and no reasonable estimate is determined. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense (benefit) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to 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 Percentage 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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