Share-Based Payments (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Summary of share based compensation expense associated with different programs
Subtotal	$ 50.2	$ 48.3	$ 104.5	$ 139.3
Capitalized share-based compensation costs	(4.4)	(2.2)	(7.5)	(5.6)
Share-based compensation expense included in total costs and expenses	45.8	46.1	97.0	133.7
Market stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	7.9	9.1	21.3	26.1
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	33.9	31.8	64.0	63.7
Cash settled performance shares
Summary of share based compensation expense associated with different programs
Share-based compensation expense	4.6	3.2	4.8	27.0
Performance units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	1.3	1.2	8.2	14.4
Employee stock purchase plan
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 2.5	$ 3.0	$ 6.2	$ 8.1