Share-Based Payments (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 169.4	$ 183.2	$ 165.0
Subtotal	204.4	207.3	252.4
Capitalized share-based compensation costs	(14.6)	(11.0)	(10.0)
Share-based compensation expense included in total costs and expenses	189.8	196.3	242.4
Market stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	38.4	38.1	37.4
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	120.0	119.0	115.4
Cash settled performance units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	16.3	22.4	65.5
Performance Units [Member]
Summary of share based compensation expense associated with different programs
Share-based compensation expense	18.6	13.9	21.9
Employee stock purchase plan
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 11.1	$ 13.9	$ 12.2