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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Class A common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 199,300,000.0us-gaap_CommonStockSharesAuthorized 199,300,000.0us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 102,300,000us-gaap_CommonStockSharesIssued 100,400,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 85,100,000us-gaap_CommonStockSharesOutstanding 85,200,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares held 17,200,000us-gaap_TreasuryStockShares 15,200,000us-gaap_TreasuryStockShares