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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Options Roll Forward |  |  |  |  |  |  |
Shares outstanding under option, Beginning Balance | 1,360,000 | 1,463,000 | 1,714,000 |  | 1,714,000 |  |
Weighted average exercise price, Beginning Balance | $ 16.48 | $ 16.35 | $ 16.11 |  | $ 16.11 |  |
Shares outstanding under option, Exercised | (63,000) | (103,000) | (251,000) |  |  |  |
Shares outstanding under option, Canceled | (7,000) |  |  |  |  |  |
Shares outstanding under option, Exercised, Weighted average exercise price | $ 14.78 | $ 14.66 | $ 14.72 |  |  |  |
Shares outstanding under option, Ending Balance | 1,290,000 | 1,360,000 | 1,463,000 |  | 1,290,000 |  | 1,714,000
Weighted average exercise price, Ending Balance | $ 16.57 | $ 16.48 | $ 16.35 |  | $ 16.57 |  | $ 16.11
Weighted average remaining contractual term | 1 year 2 months | 1 year 4 months | 1 year 6 months |  |  |  | 1 year 8 months
Aggregate intrinsic value, outstanding | $ 32.3 | $ 54.9 | $ 64.6 |  | $ 32.3 |  | $ 66.5
Status of nonvested restricted stock |  |  |  |  |  |  |
Nonvested shares subject to restriction, Beginning Balance | 1,348,000 | 1,249,000 | 1,266,000 |  | 1,266,000 |  |
Nonvested shares subject to restriction, weighted average exercise price | $ 53.15 | $ 52.49 | $ 43.57 |  | $ 43.57 |  |
Restricted shares granted to employees |  | 124,000 | 563,000 |  |  |  |
Granted shares subject to restriction, weighted average exercise price |  | $ 60.97 | $ 57.90 |  |  |  |
Shares subject to restriction, Vested |  | (20,000) | (568,000) |  |  |  |
Vested shares subject to restriction, weighted average exercise price |  | $ 61.79 | $ 38.35 |  |  |  |
Shares subject to restriction, Forfeited | (5,000) | (5,000) | (12,000) |  |  |  |
Forfeited shares subject to restriction, weighted average exercise price | $ 51.11 | $ 52.82 | $ 45.10 |  |  |  |
Nonvested shares subject to restriction, Ending Balance | 1,343,000 | 1,348,000 | 1,249,000 |  | 1,343,000 |  | 1,266,000
Nonvested shares subject to restriction, weighted average exercise price | $ 53.15 | $ 53.15 | $ 52.49 |  | $ 53.15 |  | $ 43.57
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ 14.52 |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Restricted stock compensation expense |  |  |  |  |  |  |
Restricted stock compensation expense | $ 6.9 |  |  | $ 5.4 | $ 21.1 | $ 15.3 |
Status of nonvested restricted stock |  |  |  |  |  |  |
Restricted shares granted to employees |  |  |  |  | 669,754 |  |
Stock Incentive Plan 2004 [Member] | Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |
Term of award |  |  |  |  | 10 years |  |
2014 Stock Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available for grant | 7,000,000 |  |  |  | 7,000,000 |  |
Number of shares authorized | 8,000,000 |  |  |  | 8,000,000 |  |
First Half Vested | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 2 years |  |
Percent of awards vested |  |  |  |  | 50.00% |  |
Second Half Vested | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |
Director [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Status of nonvested restricted stock |  |  |  |  |  |  |
Restricted shares granted to employees |  |  |  |  | 16,983 |  |

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