Share-Based Payments (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Summary of share based compensation expense associated with different programs
Subtotal	$ 58.9	$ 60.6	$ 193.6	$ 189.1
Capitalized share-based compensation costs	(2.3)	(2.4)	(7.5)	(7.4)
Share-based compensation expense included in total costs and expenses	56.6	58.2	186.1	181.7
Stock Options
Summary of share based compensation expense associated with different programs
Share-based compensation expense	0	0.1	0	0.5
Market stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	7.1	12.2	30.2	27.2
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	28.2	25.3	86.6	77.2
Cash settled performance shares
Summary of share based compensation expense associated with different programs
Share-based compensation expense	15.2	20.6	50.6	76.8
Performance units
Summary of share based compensation expense associated with different programs
Share-based compensation expense	5.7	0	16.0	0
Employee stock purchase plan
Summary of share based compensation expense associated with different programs
Share-based compensation expense	$ 2.7	$ 2.4	$ 10.2	$ 7.4