Share-Based Payments (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	$ (49.5)	$ (55.0)	$ (118.8)	$ (104.0)
Subtotal	45.5	82.9	121.9	132.4
Capitalized share-based compensation costs	(1.5)	(2.8)	(3.0)	(6.1)
Share-based compensation expense included in total costs and expenses	44.0	80.1	118.9	126.3
Market stock units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	7.4	7.8	26.5	15.5
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	34.5	31.8	72.0	66.5
Cash settled performance shares
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	(0.1)	0.4	(1.7)	(0.6)
Performance units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	0.0	0.3	(0.1)	0.8
Performance stock units settled in stock
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	2.1	12.1	12.4	14.1
Performance stock units settled in cash
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	(4.0)	0.9	4.9	1.9
Employee stock purchase plan
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	5.6	3.4	7.9	8.0
Nightstar | Options
Summary of share based compensation expense associated with different programs [Abstract]
NST stock options	$ 0.0	$ 26.2	$ 0.0	$ 26.2