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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Consolidated Balance Sheets    
Accounts receivable, allowance for doubtful accounts (in dollars) $ 20.2us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 12.0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Class A Common Stock, par value (in dollars per share) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Class A Common Stock, shares authorized 500,000,000us-gaap_CommonStockSharesAuthorized 500,000,000us-gaap_CommonStockSharesAuthorized
Class A Common Stock, shares issued 309,884,741us-gaap_CommonStockSharesIssued 316,412,236us-gaap_CommonStockSharesIssued
Class A Common Stock, shares outstanding 309,884,741us-gaap_CommonStockSharesOutstanding 316,412,236us-gaap_CommonStockSharesOutstanding