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CONSOLIDATED BALANCE SHEETS Balance Sheet Parenthicals (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts Receivable $ 0.8 $ 1.3
Restricted Cash and Cash Equivalents, Current 40.0 40.0
Restricted Cash and Cash Equivalents, Noncurrent $ 73.0 $ 20.5
Series A junior participating preferred stock [Member]
   
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 10,000,000 9,860,000
Preferred Stock, Shares Issued 0 0
Preferred Stock, Shares Outstanding 0 0
Series B Preferred Stock [Member]
   
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 0 140,000
Preferred Stock, Shares Issued 0 0
Preferred Stock, Shares Outstanding 0 0
Class A Common Stock (Shares) [Member]
   
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 1,000,000,000 1,000,000,000
Common Stock, Shares, Outstanding 331,832,000 330,653,000
Common Stock, Shares, Issued 331,832,000 330,653,000
Class B Common Stock (Shares) [Member]
   
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 3,000 3,000
Common Stock, Shares, Outstanding 3,000 3,000
Common Stock, Shares, Issued 3,000 3,000