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Stock-Based Compensation (Details 3) - Jun. 30, 2015 - USD ($) $ / shares in Units, $ in Millions	Total
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)	1,170,000
Granted (in shares)	693,000
Vested (in shares)	(721,000)
Cancelled (in shares)	(18,000)
Non-vested awards at the end of the period (in shares)	1,124,000
Weighted Average Grant-Date Fair Value Per Share
Non-vested awards at the beginning of the period (in dollars per share)	$ 27.37
Granted (in dollars per share)	32.00
Vested (in dollars per share)	23.70
Cancelled (in dollars per share)	32.99
Non-vested awards at the end of the period (in dollars per share)	$ 32.49
Unrecognized compensation
Expected unrecognized compensation cost related to unvested awards (in dollars)	$ 30.0
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized	2 years 2 months 12 days
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%
Vesting period	1 year
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%
Vesting period	2 years
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)	57,000
Restricted stock shares, restricted stock units and performance units
Shares
Non-vested awards at the end of the period (in shares)	1,067,000

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