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Consolidated Statements of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Income Statement [Abstract] |  |  |  |  |
Revenue from services | $ 5,562.7 us-gaap_SalesRevenueServicesNet |  | $ 5,413.1 us-gaap_SalesRevenueServicesNet |  | $ 5,450.5 us-gaap_SalesRevenueServicesNet
Cost of services | 4,654.3 us-gaap_CostOfServices |  | 4,523.6 us-gaap_CostOfServices |  | 4,553.9 us-gaap_CostOfServices
Gross profit | 908.4 us-gaap_GrossProfit |  | 889.5 us-gaap_GrossProfit |  | 896.6 us-gaap_GrossProfit
Selling, general and administrative expenses | 886.5 us-gaap_SellingGeneralAndAdministrativeExpense |  | 834.5 us-gaap_SellingGeneralAndAdministrativeExpense |  | 821.2 us-gaap_SellingGeneralAndAdministrativeExpense
Asset impairments | 0 us-gaap_AssetImpairmentCharges |  | 1.7 us-gaap_AssetImpairmentCharges |  | 3.1 us-gaap_AssetImpairmentCharges
Earnings from operations | 21.9 us-gaap_OperatingIncomeLoss |  | 53.3 us-gaap_OperatingIncomeLoss |  | 72.3 us-gaap_OperatingIncomeLoss
Other expense, net | 5.3 us-gaap_OtherNonoperatingIncomeExpense |  | 4.5 us-gaap_OtherNonoperatingIncomeExpense |  | 3.5 us-gaap_OtherNonoperatingIncomeExpense
Earnings from continuing operations before taxes | 16.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 48.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 68.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax (benefit) expense | (7.1)us-gaap_IncomeTaxExpenseBenefit |  | (10.1)us-gaap_IncomeTaxExpenseBenefit |  | 19.1 us-gaap_IncomeTaxExpenseBenefit
Earnings from continuing operations | 23.7 us-gaap_IncomeLossFromContinuingOperations |  | 58.9 us-gaap_IncomeLossFromContinuingOperations |  | 49.7 us-gaap_IncomeLossFromContinuingOperations
Earnings from discontinued operations, net of tax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 0.4 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net earnings | $ 23.7 us-gaap_NetIncomeLoss |  | $ 58.9 us-gaap_NetIncomeLoss |  | $ 50.1 us-gaap_NetIncomeLoss
Basic earnings per share |  |  |  |  |
Earnings from continuing operations (in dollars per share) | $ 0.61 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 1.54 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 1.31 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Earnings from discontinued operations (in dollars per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net earnings (in dollars per share) | $ 0.61 us-gaap_EarningsPerShareBasic | [1] | $ 1.54 us-gaap_EarningsPerShareBasic | [1] | $ 1.32 us-gaap_EarningsPerShareBasic
Diluted earnings per share |  |  |  |  |
Earnings from continuing operations (in dollars per share) | $ 0.61 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 1.54 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 1.31 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Earnings from discontinued operations (in dollars per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net earnings (in dollars per share) | $ 0.61 us-gaap_EarningsPerShareDiluted | [1] | $ 1.54 us-gaap_EarningsPerShareDiluted | [1] | $ 1.32 us-gaap_EarningsPerShareDiluted
Dividends per share (in dollars per share) | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid |  | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid |  | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid
Average shares outstanding (millions): |  |  |  |  |
Basic (in shares) | 37.5 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 37.3 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 37.0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) | 37.5 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 37.3 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 37.0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[1] | Earnings per share amounts for each quarter are required to be computed independently and may not equal the amounts computed for the total year.

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