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CONSOLIDATED BALANCE SHEETS Balance Sheet Parenthicals - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Allowance for Doubtful Accounts Receivable $ 2.7 $ 2.2
Restricted Cash and Cash Equivalents, Current 1.5 0.0
Restricted Cash and Cash Equivalents, Noncurrent $ 1.2 $ 2.4
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 10,000,000
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 $ 0.00 $ 0.00
Preferred Stock, Shares Authorized 0 0
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 356,824,000 339,235,000
Common Stock, Shares, Issued 356,824,000 339,235,000
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