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Share-Based Payments (Details 1) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of share based compensation expense associated with different programs        
Share-based compensation expense $ 191.2 $ 168.7   $ (138.1)
Subtotal 225.4 181.6 $ 169.7  
Capitalized share-based compensation costs (8.9) (11.5) (9.6)  
Share-based compensation expense included in total costs and expenses 216.5 170.1 160.1  
Market stock units        
Summary of share based compensation expense associated with different programs        
Share-based compensation expense 30.4 27.2 22.4  
Time-vested restricted stock units        
Summary of share based compensation expense associated with different programs        
Share-based compensation expense 134.0 126.6 107.3  
Cash settled performance units        
Summary of share based compensation expense associated with different programs        
Share-based compensation expense 0.7 7.8 18.4  
Performance Units        
Summary of share based compensation expense associated with different programs        
Share-based compensation expense 1.6 3.1 12.3  
Performance stock units settled in stock        
Summary of share based compensation expense associated with different programs        
Share-based compensation expense 15.5 4.7 0.0  
Performance stock units settled in cash        
Summary of share based compensation expense associated with different programs        
Share-based compensation expense 5.5 1.7 0.0  
Employee stock purchase plan        
Summary of share based compensation expense associated with different programs        
Share-based compensation expense 11.5 10.5 9.3  
Nightstar | Share-based Payment Arrangement, Option        
Summary of share based compensation expense associated with different programs        
Fair-value post-combination equity compensation $ 26.2 $ 0.0 $ 0.0