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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Unrecognized Tax Benefits |  |  |
Balance at the beginning of period | $ 18.6 | $ 17.2 | $ 16.4
Increases related to prior periods (acquired entities) | 0.4 | 1.4 | 0.4
Increases related to current year tax positions | 1.1 | 0.2 | 0.9
Expiration of applicable statutes of limitations | (0.6) | (0.2) |
Decrease in federal tax rate | (3.9) |  |
Decreases related to disposition |  |  | (0.5)
Balance at the end of period | $ 15.6 | $ 18.6 | $ 17.2

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- Definition Unrecognized Tax Benefits, Decrease Resulting from Disposition + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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