Share-Based Payments (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Summary of share based compensation expense associated with different programs
Subtotal	$ 58.1	$ 69.1	$ 134.7	$ 128.6
Capitalized share-based compensation costs	(2.6)	(2.7)	(5.2)	(5.0)
Share-based compensation expense included in total costs and expenses	55.5	66.4	129.5	123.6
Stock Options
Summary of share based compensation expense associated with different programs
Share-based compensation expense	0	0.1	0	0.4
Market stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	8.2	6.6	23.1	15.1
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	29.2	24.8	58.4	51.9
Cash settled performance shares
Summary of share based compensation expense associated with different programs
Share-based compensation expense	14.0	35.8	35.4	56.2
Performance units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	4.0	0	10.3	0
Employee stock purchase plan
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 2.7	$ 1.8	$ 7.5	$ 5.0