Share-Based Payments (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	$ 47.8	$ 40.4	$ 151.8	$ 128.0
Subtotal	49.6	50.4	182.0	143.6
Capitalized share-based compensation costs	(1.7)	(3.5)	(7.8)	(9.7)
Share-based compensation expense included in total costs and expenses	47.9	46.9	174.2	133.9
Market stock units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	9.3	7.4	24.8	20.6
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	37.9	29.9	104.4	96.6
Cash settled performance shares
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	0.3	5.8	(0.3)	9.4
Performance units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	0.2	3.0	1.0	4.2
Performance stock units settled in stock
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	(1.1)	1.3	13.0	3.4
Performance stock units settled in cash
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	1.3	1.1	3.2	1.5
Employee stock purchase plan
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	1.7	1.9	9.7	7.9
Nightstar | NST stock option
Summary of share based compensation expense associated with different programs [Abstract]
Fair value of post-combination equity compensation	$ 0.0	$ 0.0	$ 26.2	$ 0.0