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Income Taxes - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Oct. 01, 2017 | Jun. 25, 2017 | Mar. 26, 2017 | Dec. 25, 2016 | Sep. 25, 2016 | Jun. 26, 2016 | Mar. 27, 2016 | Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax (benefit) at federal statutory rate |  |  |  |  |  |  |  |  | $ (17.8) | $ (18.3) | $ (15.6)
State taxes, net of federal tax benefit and valuation allowance |  |  |  |  |  |  |  |  | 0.7 | 0.2 | (0.2)
Difference in tax rates between U.S. and foreign |  |  |  |  |  |  |  |  | 0.0 | 0.1 | (0.7)
Increase (decrease) in valuation allowance |  |  |  |  |  |  |  |  | (45.6) | 19.1 | 0.0
Nondeductible expense |  |  |  |  |  |  |  |  | 1.1 | 0.7 | 0.8
Increase in reserve for uncertain tax positions |  |  |  |  |  |  |  |  | 1.3 | 2.2 | 0.9
Changes to indefinite life items and separate state deferred taxes |  |  |  |  |  |  |  |  | (2.2) | 4.1 | 3.4
One-time transition tax on previously undistributed foreign earnings |  |  |  |  |  |  |  |  | 6.2 | 0.0 | 0.0
Goodwill impairment |  |  |  |  |  |  |  |  | 8.1 | 0.0 | 0.0
Impact related to the 2017 Tax Act |  |  |  |  |  |  |  |  | 40.0 | 0.0 | 0.0
Total | $ (11.7) | $ 0.2 | $ 1.8 | $ 1.5 | $ 0.8 | $ 1.9 | $ 1.8 | $ 3.6 | $ (8.2) | $ 8.1 | $ (11.4)

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from 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 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 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 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. + 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 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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