Share-Based Payments (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 165,004,000	$ 146,210,000	$ 123,956,000
Subtotal	252,400,000	255,900,000	184,300,000
Capitalized share-based compensation costs	(10,000,000)	(9,800,000)	(5,400,000)
Share-based compensation expense included in total costs and expenses	242,400,000	246,100,000	178,900,000
Stock options
Summary of share based compensation expense associated with different programs
Share-based compensation expense	0	600,000	2,300,000
Market stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	37,400,000	32,800,000	23,300,000
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	115,400,000	103,500,000	93,000,000
Performance-vested restricted stock units settled in shares [Member]
Summary of share based compensation expense associated with different programs
Share-based compensation expense	0	0	100,000
Cash settled performance units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	65,500,000	109,800,000	60,400,000
Performance units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	21,900,000	0	0
Employee stock purchase plan
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 12,200,000	$ 9,200,000	$ 5,200,000