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Stock-Based Compensation - Options (Details) - Jun. 30, 2015 - Stock Options - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
Total
Total
Number of Shares    
Beginning Balance (in shares)   2,840
Granted (in shares)   440
Exercised (in shares)   (880)
Forfeited (in shares)   (80)
Ending balance (in shares) 2,320 2,320
Options exercisable (in shares) 1,820 1,820
Weighted- Average Grant Date Fair Value    
Beginning balance (dollars per share)   $ 24.18
Granted (dollars per share)   57.60
Exercised (dollars per share)   11.99
Forfeited (dollars per share)   57.20
Ending balance (dollars per share) $ 33.85 33.85
Options exercisable (dollars per share) $ 27.72 $ 27.72
Ending balance weighted average remaining contractual term (in years)   5 years 10 months 2 days
Options exercisable weighted average remaining contractual term (in years)   4 years 10 months 10 days
Ending balance aggregate intrinsic value $ 71.1 $ 71.1
Options exercisable aggregate intrinsic value 69.4 69.4
Total intrinsic value of options exercised $ 41.5 $ 40.5