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Consolidated Balance Sheet (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowance for Doubtful Accounts Receivable, Current $ 0.8us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 0.8us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Deferred Tax Liabilities, Other $ 120.6us-gaap_DeferredTaxLiabilitiesOther $ 152.4us-gaap_DeferredTaxLiabilitiesOther
Preferred Stock, Shares Authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Shares Issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Stock, Shares Outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common Stock, Par or Stated Value Per Share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized 90,000,000us-gaap_CommonStockSharesAuthorized 90,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued 21,197,164us-gaap_CommonStockSharesIssued 21,103,700us-gaap_CommonStockSharesIssued
Common Stock, Shares, Outstanding 17,607,251us-gaap_CommonStockSharesOutstanding 18,147,017us-gaap_CommonStockSharesOutstanding
Treasury Stock, Shares 3,589,913us-gaap_TreasuryStockShares 2,956,683us-gaap_TreasuryStockShares