Stock-Based Compensation (Details 3) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Performance-contingent
Number of shares outstanding subject to RSUs and vesting or performance conditions with vesting
Balance at the beginning of the period (in shares)	1,772,000
Granted (in shares)	437,000
Released RSUs and RSAs (in shares)	(883,000)
Forfeited (in shares)	(21,000)
Balance at the end of the period (in shares)	1,305,000	1,772,000
Weighted-average fair value per share at grant
Balance at the beginning of the period (in dollars per share)	$ 25.78
Granted (in dollars per share)	13.76
Released RSUs and RSAs (in dollars per share)	25.22
Forfeited (in dollars per share)	20.33
Balance at the end of the period (in dollars per share)	$ 18.00	$ 25.78
Stock options
Number of Shares Subject to Outstanding Options
Balance at the beginning of the period (in shares)	5,422,000
Exercised (in shares)	(111,000)
Forfeited (in shares)	(1,049,000)
Balance at the end of the period (in shares)	4,262,000	5,422,000
Weighted-average exercise price of outstanding options
Balance at the beginning of the period (in dollars per share)	$ 22.46
Exercised (in dollars per share)	13.75
Forfeited (in dollars per share)	21.19
Balance at the end of the period (in dollars per share)	$ 23.00	$ 22.46
Additional disclosures
Aggregate intrinsic value of options outstanding	$ 0.1
Aggregate intrinsic value of options exercisable	0.1
Total intrinsic value of options exercised	0.5	$ 17.5	$ 41.4
Total estimated fair value of options vested	$ 10.0	$ 5.7	$ 3.7
Weighted-average assumptions
Risk-free interest rate, minimum (as a percent)		1.60%	0.80%
Risk-free interest rate, maximum (as a percent)		2.10%	2.00%
Volatility, minimum (as a percent)		52.00%	58.00%
Volatility, maximum (as a percent)		60.00%	60.00%
Weighted-average estimated fair value of shares granted		$ 15.63	$ 19.96
Stock options | Minimum
Weighted-average assumptions
Expected life (in years)		5 years	5 years
Dividend yield (as a percent)		3.00%
Stock options | Maximum
Weighted-average assumptions
Expected life (in years)		6 years	6 years
Dividend yield (as a percent)		4.00%
RSUs
Number of shares outstanding subject to RSUs and vesting or performance conditions with vesting
Balance at the beginning of the period (in shares)	775,000
Granted (in shares)	141,000
Released RSUs and RSAs (in shares)	(327,000)
Forfeited (in shares)	(130,000)
Balance at the end of the period (in shares)	459,000	775,000
Weighted-average fair value per share at grant
Balance at the beginning of the period (in dollars per share)	$ 18.53
Granted (in dollars per share)	15.50
Released RSUs and RSAs (in dollars per share)	17.66
Forfeited (in dollars per share)	18.07
Balance at the end of the period (in dollars per share)	$ 18.34	$ 18.53
RSUs | Performance-contingent
Number of shares outstanding subject to RSUs and vesting or performance conditions with vesting
Balance at the end of the period (in shares)	0
Employee Stock Purchase Plan
Weighted-average assumptions
Risk-free interest rate, minimum (as a percent)	0.10%	0.10%	0.10%
Risk-free interest rate, maximum (as a percent)	0.90%	0.50%	0.30%
Volatility, minimum (as a percent)	44.00%	43.00%	56.00%
Volatility, maximum (as a percent)	69.00%	55.00%	61.00%
Dividend yield (as a percent)		8.00%
Weighted-average estimated fair value of shares granted	$ 4.52	$ 4.49	$ 16.44
Employee Stock Purchase Plan | Minimum
Weighted-average assumptions
Expected life (in years)	6 months	6 months	6 months
Dividend yield (as a percent)	0.00%
Employee Stock Purchase Plan | Maximum
Weighted-average assumptions
Expected life (in years)	2 years	2 years	2 years
Dividend yield (as a percent)	6.00%