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Balance Sheet Parenthetical (Parentheticals) - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2016
Dec. 31, 2015
Current assets    
Allowance for Doubtful Accounts Receivable, Current $ 13.1 $ 6.6
Stockholders' equity    
Preferred Stock, Par or Stated Value Per Share $ 0.01  
Common Stock, par or Stated Value Per Share $ 0.01  
Common Stock, Shares Authorized 53.3  
Common Stock, shares outstanding 18.5 18.5
Treasury Stock, shares 0.8 0.8
Preferred Stock [Member]    
Stockholders' equity    
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, shares authorized 10.0 10.0
Preferred Stock, shares issued 0.0 0.0
Preferred Stock, shares outstanding 0.0 0.0
Perpetual Preferred Stock Member    
Stockholders' equity    
Preferred Stock, shares authorized 0.8 0.8
Preferred Stock, shares issued 0.0 0.0
Preferred Stock, shares outstanding 0.0 0.0
Series Common Stock Member    
Stockholders' equity    
Common Stock, par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 40.0 40.0
Common Stock, shares issued 0.0 0.0
Common Stock, shares outstanding 0.0 0.0
Common Stock [Member]    
Stockholders' equity    
Common Stock, par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 53.3 53.3
Common Stock, shares issued 19.3 19.3
Common Stock, shares outstanding 18.5 18.5