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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Details) $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units
Shares
Non-vested awards at the beginning of the period (in shares)	1,170
Granted (in shares)	697
Vested (in shares)	(731)
Cancelled (in shares)	(35)
Non-vested awards at the end of the period (in shares)	1,101
Weighted Average Grant-Date Fair Value Per Share
Non-vested awards at the beginning of the period (in dollars per share) | $ / shares	$ 27.37
Granted (in dollars per share) | $ / shares	31.93
Vested (in dollars per share) | $ / shares	23.89
Cancelled (in dollars per share) | $ / shares	33.25
Non-vested awards at the end of the period (in dollars per share) | $ / shares	$ 32.38
Unrecognized compensation
Expected unrecognized compensation cost related to unvested awards (in dollars) | $	$ 24.8
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized	2 years
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units | First anniversary vesting
Stock-based compensation
Vesting percentage	33.33%
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units | Second anniversary vesting
Stock-based compensation
Vesting percentage	33.33%
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units | Third anniversary vesting
Stock-based compensation
Vesting percentage	33.33%
Vesting period	3 years
Cash settled restricted stock units and cash settled performance units
Shares
Non-vested awards at the end of the period (in shares)	57
Restricted stock shares, restricted stock units and performance units
Shares
Non-vested awards at the end of the period (in shares)	1,044

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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