Consolidated Statements of Stockholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common stock	Additional paid-in capital	Retained earnings (accumulated deficit)	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interest	Series A	Series B
Balances at Dec. 31, 2012	$ 9,703.4	$ 4.5	$ 9,730.9	$ 4,862.0	$ 640.3	$ (5,554.4)	$ 20.0	$ 0	$ 0.1
Increase (decrease) in stockholders' equity
Common stock issued	80.2	0.1	80.1
Stock-based compensation and additional related tax benefits	51.3		54.7	(3.4)
Treasury stock acquired, common	(153.4)					(153.4)
Dividends to common stockholders	(211.7)			(211.7)
Dividends to preferred stockholders	(24.7)			(24.7)
Contributions from noncontrolling interest	115.7						115.7
Purchase of subsidiary shares from noncontrolling interest	(51.4)		1.8				(53.2)
Sale of subsidiary shares to noncontrolling interest	31.8		11.5				20.3
Adjustments to redemption amount of redeemable noncontrolling interest	(179.5)		(129.7)	(43.3)			(6.5)
Net income (loss) (excludes $8.3 million and $9.0 million attributable to redeemable noncontrolling interest in 2014 and 2013 respectively)	676.7			671.0			5.7
Other comprehensive income (loss) (excludes $(1.5) million and $(3.3) million attributable to redeemable noncontrolling interest in 2014 and 2013 respectively)	(665.0)				(658.0)		(7.0)
Balances at Sep. 30, 2013	9,373.4	4.6	9,749.3	5,249.9	(17.7)	(5,707.8)	95.0	0	0.1
Balances at Dec. 31, 2013	9,777.0	4.6	9,798.9	5,405.4	183.2	(5,708.0)	92.8	0	0.1
Increase (decrease) in stockholders' equity
Common stock issued	69.6		69.6
Stock-based compensation and additional related tax benefits	57.8		62.3	(4.5)
Treasury stock acquired, common	(222.5)					(222.5)
Dividends to common stockholders	(276.7)			(276.7)
Dividends to preferred stockholders	(24.7)			(24.7)
Distributions to noncontrolling interest	(22.9)						(22.9)
Contributions from noncontrolling interest	7.1						7.1
Purchase of subsidiary shares from noncontrolling interest	(41.9)		(0.4)				(41.5)
Adjustments to redemption amount of redeemable noncontrolling interest	(33.2)		(13.5)	(19.7)
Net income (loss) (excludes $8.3 million and $9.0 million attributable to redeemable noncontrolling interest in 2014 and 2013 respectively)	887.8			865.4			22.4
Other comprehensive income (loss) (excludes $(1.5) million and $(3.3) million attributable to redeemable noncontrolling interest in 2014 and 2013 respectively)	191.6				196.9		(5.3)
Balances at Sep. 30, 2014	$ 10,369.0	$ 4.6	$ 9,916.9	$ 5,945.2	$ 380.1	$ (5,930.5)	$ 52.6	$ 0	$ 0.1