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Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jul. 22, 2013
Feb. 24, 2015
Statement of Stockholders' Equity          
Dividends Per Common Share $ 0.39us-gaap_CommonStockDividendsPerShareCashPaid $ 0.33us-gaap_CommonStockDividendsPerShareCashPaid      
Preferred Stock, Shares Authorized 10,000,000us-gaap_PreferredStockSharesAuthorized   10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized  
Preferred Stock, Par or Stated Value Per Share       $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare  
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued $ 0us-gaap_PreferredStockValue   $ 0us-gaap_PreferredStockValue    
Common Class C [Member]          
Statement of Stockholders' Equity          
Common Stock, Voting Rights 1/100th        
Common Class B [Member]          
Statement of Stockholders' Equity          
Common Stock, Par or Stated Value Per Share         $ 10,000.00us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Class D [Member]          
Statement of Stockholders' Equity          
Common Stock, Voting Rights 1/100th        
Common Class A [Member]          
Statement of Stockholders' Equity          
Common Stock, Par or Stated Value Per Share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember