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Balance Sheet Parenthetical (Parentheticals) - Successor - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2018
Dec. 31, 2017
Current assets    
Allowance for Doubtful Accounts Receivable, Current $ 4.4 $ 4.6
Stockholders' equity    
Preferred Stock, shares authorized 100.0  
Preferred Stock, shares outstanding (in shares) 0.0 13.5
Common stock, shares outstanding (in shares) 110.4 105.2
Treasury Stock, shares 27.3 5.8
Preferred Stock    
Stockholders' equity    
Preferred Stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Preferred Stock, shares authorized 100.0 50.0
Preferred Stock, shares issued (in shares) 0.0 0.0
Preferred Stock, shares outstanding (in shares) 0.0 0.0
Series Common Stock    
Stockholders' equity    
Common Stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Common Stock, shares authorized 50.0 50.0
Common Stock, shares issued (in shares) 0.0 0.0
Common stock, shares outstanding (in shares) 0.0 0.0
Common Stock    
Stockholders' equity    
Common Stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Common Stock, shares authorized 450.0 450.0
Common Stock, shares issued (in shares) 137.7 111.8
Common stock, shares outstanding (in shares) 110.4 105.2
Convertible Preferred Stock    
Stockholders' equity    
Preferred Stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Preferred Stock, shares authorized 0.0 50.0
Preferred Stock, shares issued (in shares) 0.0 30.0
Preferred Stock, shares outstanding (in shares) 0.0 13.5