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Income Taxes - Deferred Taxes (Details) (USD $) In Millions, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Components of Deferred Tax Assets and Liabilities
Depreciation and amortization	$ (11.6)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment	$ (10.4)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Employee compensation and benefit plans	70.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	68.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Workers’ compensation	21.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	22.8us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Unrealized gain on securities	(23.7)us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	(17.2)us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Loss carryforwards	47.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	49.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Credit carryforwards	103.0us-gaap_TaxCreditCarryforwardDeferredTaxAsset	82.0us-gaap_TaxCreditCarryforwardDeferredTaxAsset
Other, net	8.2us-gaap_DeferredTaxAssetsOther	0.2us-gaap_DeferredTaxAssetsOther
Valuation allowance	(58.5)us-gaap_DeferredTaxAssetsValuationAllowance	(56.3)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets	$ 156.6us-gaap_DeferredTaxAssetsNet	$ 138.6us-gaap_DeferredTaxAssetsNet

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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