Employee Benefit Plans, Share Based Compensation, Equity Instruments Other Than Options (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Feb. 20, 2014	Mar. 31, 2014	Mar. 31, 2014 Employee stock purchase plan 2008 [Member]	Mar. 31, 2013 Employee stock purchase plan 2008 [Member]	Mar. 31, 2014 Restricted stock units (RSUs)		Mar. 31, 2014 Performance shares (PSAs)		Mar. 31, 2014 Restricted stock awards (RSAs)		Mar. 31, 2014 RSUs, RSAs, and PSAs [Member]
Number of Shares
Balance as of December 31, 2013 (in shares)											25,400,000
Granted (in shares)					1,900,000	[1],[2]	800,000	[1],[3]
Assumed (in shares)					400,000	[4]	200,000	[4]	900,000	[4]
Vested (in shares)		(1,000,000)			(4,600,000)				(300,000)
Canceled (in shares)					(500,000)		(2,100,000)
Balance as of March 31, 2014 (in shares)											21,100,000
Weighted Average Grant-Date Fair Value per Share
Balance as of December 31, 2013 (in dollars per share)											$ 23.44
Granted (in dollars per share)					$ 22.14	[1],[2]	$ 25.22	[1],[3]
Assumed (in dollars per share)					$ 22.66	[4]	$ 22.66	[4]	$ 22.66	[4]
Vested (in dollars per share)					$ 24.05		$ 38.10		$ 19.59
Canceled (in dollars per share)					$ 21.55		$ 33.85
Balance as of March 31, 2014 (in dollars per share)											$ 21.57
Weighted Average Remaining Contractual Term (In Years)											1 year 4 months 24 days
Aggregate Intrinsic Value											$ 543.3
Aggregate number of shares subject to PSAs granted							400,000
Minimum shares to be issued on achievement of performance goals in respect of PSAs							0
Maximum shares to be issued on achievement of performance goals in respect of PSAs							800,000
Intended quarterly cash dividend based on most recent announcement (in dollars per share)	$ 0.1
Employee Stock Purchase Plan
Employee stock purchase plans offering period duration			6 months
Stock issued during period, shares, employee stock purchase plans			1,500,000	1,900,000
Average price of common stock, per share			$ 18.67	$ 15.05

[1] On February 20, 2014, the Company announced its intention to initiate a quarterly cash dividend of $0.10 per share of common stock in the third quarter of 2014. As a result of the Company's announcement, the grant date fair value of RSUs and PSAs granted after the announcement date were reduced by the present value of the dividends expected to be paid on the underlying shares of common stock during the requisite and derived service period as these awards are not entitled to receive dividends until vested.

[2] Includes service-based and market-based RSUs granted under the 2006 Plan according to its terms.

[3] The number of shares subject to PSAs granted represents the aggregate maximum number of shares that may be issued pursuant to the award over its full term. The aggregate number of shares subject to these PSAs that would be issued if performance goals determined by the Compensation Committee are achieved at target is 0.4 million shares. Depending on achievement of such performance goals, the range of shares that could be issued under these awards is 0 to 0.8 million shares.

[4] RSUs, RSAs, and PSAs assumed in connection with the acquisition of WANDL.