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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Options Roll Forward |  |  |  |  |  |
Shares outstanding under option, Beginning Balance | 1,102,000 | 1,267,000 |  | 1,267,000 |  |
Weighted average exercise price, Beginning Balance | $ 16.56 | $ 16.59 |  | $ 16.59 |  |
Shares outstanding under option, Exercised | (224,000) | (165,000) |  |  |  |
Shares outstanding under option, Exercised, Weighted average exercise price | $ 14.67 | $ 16.81 |  |  |  |
Shares outstanding under option, Ending Balance | 878,000 | 1,102,000 |  | 878,000 |  | 1,267,000
Weighted average exercise price, Ending Balance | $ 17.04 | $ 16.56 |  | $ 17.04 |  | $ 16.59
Weighted average remaining contractual term | 6 months | 8 months |  |  |  | 11 months
Aggregate intrinsic value, outstanding | $ 10.9 | $ 24.1 |  | $ 10.9 |  | $ 33.7
Status of nonvested restricted stock |  |  |  |  |  |
Nonvested shares subject to restriction, Beginning Balance | 1,482,000 | 1,326,000 |  | 1,326,000 |  |
Nonvested shares subject to restriction, weighted average exercise price | $ 45.03 | $ 53.18 |  | $ 53.18 |  |
Restricted shares granted to employees | 25,000 | 668,000 |  |  |  |
Granted shares subject to restriction, weighted average exercise price | $ 38.62 | $ 29.61 |  |  |  |
Shares subject to restriction, Vested | (55,000) | (493,000) |  |  |  |
Vested shares subject to restriction, weighted average exercise price | $ 60.23 | $ 46.06 |  |  |  |
Shares subject to restriction, Forfeited | (12,000) | (19,000) |  |  |  |
Forfeited shares subject to restriction, weighted average exercise price | $ 47.22 | $ 42.84 |  |  |  |
Nonvested shares subject to restriction, Ending Balance | 1,440,000 | 1,482,000 |  | 1,440,000 |  | 1,326,000
Nonvested shares subject to restriction, weighted average exercise price | $ 44.32 | $ 45.03 |  | $ 44.32 |  | $ 53.18
Restricted Stock [Member] |  |  |  |  |  |
Restricted stock compensation expense |  |  |  |  |  |
Restricted stock compensation expense | $ 6.7 |  | $ 6.9 | $ 13.1 | $ 14.2 |
Status of nonvested restricted stock |  |  |  |  |  |
Restricted shares granted to employees |  |  |  | 667,874 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | 38.2 |  |  | $ 38.2 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance share compensation expense | $ 4.2 |  | $ 2.9 | $ 7.2 | $ 6.5 |
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 | 5,700,000 |  |  | 5,700,000 |  |
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 |  |  |  | 25,048 |  |

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