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Accounting Policies (Details 5) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2012 | Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 31, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2013 | May 16, 2012
Net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ (7.7)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 22.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 21.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 14.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 8.2 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 15.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 18.9 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 16.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 50.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 58.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 68.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares (in shares) |  |  |  |  |  |  |  |  |  | 35,300,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 35,500,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 36,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  |
Per Share Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |
NET INCOME (in dollars per share) |  | $ (0.22)us-gaap_EarningsPerShareBasic | $ 0.64 us-gaap_EarningsPerShareBasic | $ 0.60 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.43 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 1.42 us-gaap_EarningsPerShareBasic | $ 1.65 us-gaap_EarningsPerShareBasic | $ 1.90 us-gaap_EarningsPerShareBasic |  |
Dilutive securities, principally common stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  | 100,000 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 100,000 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 100,000 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  |
Net Income |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 50.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 58.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 68.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  |
Weighted average number of shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares (in shares) |  |  |  |  |  |  |  |  |  | 35,400,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 35,600,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 36,100,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  |
Per Share Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |
NET INCOME (in dollars per share) |  | $ (0.22)us-gaap_EarningsPerShareDiluted | $ 0.64 us-gaap_EarningsPerShareDiluted | $ 0.60 us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.43 us-gaap_EarningsPerShareDiluted | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 1.42 us-gaap_EarningsPerShareDiluted | $ 1.65 us-gaap_EarningsPerShareDiluted | $ 1.90 us-gaap_EarningsPerShareDiluted |  |
Securities not included in the computation of diluted EPS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options to purchase shares of Class A common stock |  |  |  |  |  |  |  |  |  | 300,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 200,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 200,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |
Number of shares of the entity's Class A common stock authorized to be repurchased |  |  |  |  |  |  |  |  |  |  |  |  | 90.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |
Number of shares of the entity's Class A common stock authorized to be repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Number of shares of Class A common stock repurchased | 2,000,000 us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |  |  |  |  |  | 670,000 us-gaap_StockRepurchasedDuringPeriodShares | 454,000 us-gaap_StockRepurchasedDuringPeriodShares |  |  |
Cost of shares of Class A common stock repurchased | 65.8 us-gaap_StockRepurchasedDuringPeriodValue |  |  |  |  |  |  |  |  | 39.6 us-gaap_StockRepurchasedDuringPeriodValue | 23.0 us-gaap_StockRepurchasedDuringPeriodValue |  |  |
Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow hedges, fair value |  | 0 us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet |  |  |  | 0 us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet |  |  |  | 0 us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet | 0 us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet |  |  |
Shipping and Handling Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shipping, Handling and Transportation Costs |  |  |  |  |  |  |  |  |  | 61.8 us-gaap_ShippingHandlingAndTransportationCosts | 61.3 us-gaap_ShippingHandlingAndTransportationCosts | 58.4 us-gaap_ShippingHandlingAndTransportationCosts |  |
Research and Development Expense. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  |  | $ 22.5 us-gaap_ResearchAndDevelopmentExpense | $ 21.5 us-gaap_ResearchAndDevelopmentExpense | $ 20.4 us-gaap_ResearchAndDevelopmentExpense |  |

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