Share-Based Payments (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	$ (35.4)	$ (47.8)	$ (154.2)	$ (151.8)
Subtotal	39.6	49.6	161.5	182.0
Capitalized share-based compensation costs	(1.9)	(1.7)	(4.9)	(7.8)
Share-based compensation expense included in total costs and expenses	37.7	47.9	156.6	174.2
Market stock units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	5.5	9.3	32.0	24.8
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	35.3	37.9	107.3	104.4
Cash settled performance shares
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	0.0	0.3	(1.7)	(0.3)
Performance units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	0.0	0.2	(0.1)	1.0
Performance stock units settled in stock
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	(8.4)	(1.1)	4.0	13.0
Performance stock units settled in cash
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	4.1	1.3	9.0	3.2
Employee stock purchase plan
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	3.1	1.7	11.0	9.7
Nightstar | Options
Summary of share based compensation expense associated with different programs [Abstract]
NST stock options	$ 0.0	$ 0.0	$ 0.0	$ 26.2