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Stock-Based Compensation - Schedule of RSU and PRSU Award Activity (Details)
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Restricted Stock Units (RSUs)  
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]  
Granted | shares 419,609
Vested | shares (468,765)
Forfeitures | shares (31,744)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Grants (per share) $ 29.64
Weighted Average Grant Date Fair Value, Vested (per share) 21.28
Weighted Average Grant Date Fair Value, Forfeited (per share) $ 25.41
Performance Restricted Stock Units (PRSUs)  
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]  
Granted | shares 226,197
Vested | shares (75,460)
Forfeitures | shares (25,751)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Grants (per share) $ 29.83
Weighted Average Grant Date Fair Value, Vested (per share) 28.61
Weighted Average Grant Date Fair Value, Forfeited (per share) $ 26.42
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”)  
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]  
Non-vested as of beginning of period | shares 1,278,602
Non-vested as of end of period | shares 1,322,688
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Non-Vested, Beginning Balance (per share) $ 21.92
Weighted Average Grant Date Fair Value, Non-Vested, Ending Balance (per share) $ 26.46