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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Millions
Sep. 30, 2019
Dec. 31, 2018
Accounts receivable, allowance $ 2.9 $ 2.7
Short-term restricted cash 5.1 1.5
Accumulated depreciation and amortization, property 837.3 761.1
Long-term restricted cash $ 0.9 $ 1.2
Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000 10,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Class A Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,000,000 1,000,000
Common stock, shares issued (in shares) 357,447 356,824
Common stock, shares outstanding (in shares) 357,447 356,824
Class B Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 3 3
Common stock, shares issued (in shares) 3 3
Common stock, shares outstanding (in shares) 3 3