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Stock-Based Compensation Plans - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2015 | Dec. 31, 2014
Additional share-based compensation disclosures |  |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  |  |  | $ 27.3 |
Weighted average recognition period for unrecognized compensation cost (in years) | 1 year 4 months 10 days |  |  |  |  |  |
Restricted stock, 2015 grant |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Awards granted (in shares) | 507,760 |  |  |  |  |  |
The number of grants made during the period on the basis of service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). |  |  |  |  |  | 185,450 |
Fair value of restricted stock granted (in dollars per share) | $ 59.27 |  |  |  |  |  |
Share of common stock | 1 |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Granted (in shares) | 507,760 |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per shares) | $ 59.27 |  |  |  |  |  |
Restricted stock, 2014 grant |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Awards granted (in shares) |  | 349,380 |  |  |  |  |
The number of grants made during the period on the basis of service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). |  |  |  |  |  |  | 136,162
Fair value of restricted stock granted (in dollars per share) |  | $ 71.15 |  |  |  |  |
Share of common stock |  | 1 |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Granted (in shares) |  | 349,380 |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per shares) |  | $ 71.15 |  |  |  |  |
Restricted stock, 2013 grant |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Awards granted (in shares) |  |  | 327,780 |  |  |  |
The number of grants made during the period on the basis of service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). |  |  | 136,225 |  |  |  |
Fair value of restricted stock granted (in dollars per share) |  |  | $ 65.75 |  |  |  |
Share of common stock |  |  | 1 |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Granted (in shares) |  |  | 327,780 |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per shares) |  |  | $ 65.75 |  |  |  |
Restricted stock, 2011 grant |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Awards granted (in shares) |  |  |  | 86,000 |  |  |
Fair value of restricted stock granted (in dollars per share) |  |  |  | $ 37.29 |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 86,000 |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per shares) |  |  |  | $ 37.29 |  |  |
Restricted stock, 2010 grant |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Awards granted (in shares) |  |  |  |  | 61,000 |  |
Fair value of restricted stock granted (in dollars per share) |  |  |  |  | $ 41.24 |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 61,000 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per shares) |  |  |  |  | $ 41.24 |  |
Restricted stock and RSUs |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Awards granted (in shares) | 570,479 |  |  |  |  |  |
Fair value of restricted stock granted (in dollars per share) | $ 59.42 |  |  |  |  |  |
Number of shares unvested and outstanding | 846,760 | 846,760 |  |  |  | 900,410 | 846,760
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) | 846,760 |  |  |  |  |  |
Granted (in shares) | 570,479 |  |  |  |  |  |
Forfeited (in shares) | (106,205) |  |  |  |  |  |
Vested (in shares) | (410,624) |  |  |  |  |  |
Unvested at the end of the period (in shares) | 900,410 | 846,760 |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) | $ 65.10 |  |  |  |  |  |
Granted (in dollars per shares) | 59.42 |  |  |  |  |  |
Forfeited (in dollars per shares) | 60.03 |  |  |  |  |  |
Vested (in dollars per shares) | 62.56 |  |  |  |  |  |
Unvested at the end of the period (in dollars per shares) | $ 63.26 | $ 65.10 |  |  |  |  |
Restricted stock 2010 and 2011 grant |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Vesting period (in years) | 5 years |  |  |  |  |  |
Number of shares unvested and outstanding | 17,200 |  |  |  |  | 17,200 |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Unvested at the end of the period (in shares) | 17,200 |  |  |  |  |  |
Time-based | RSU's | Former CEO |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Awards granted (in shares) | 10,000 |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Granted (in shares) | 10,000 |  |  |  |  |  |
Performance-based | RSU's |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Performance target period (in years) | 3 years |  |  |  |  |  |
Performance-based | RSU's | Former CEO |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Awards granted (in shares) | 40,000 |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Granted (in shares) | 40,000 |  |  |  |  |  |
Directors Equity Plan | Restricted stock |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Awards granted (in shares) | 12,719 | 11,830 | 12,418 |  |  |  |
Fair value of restricted stock granted (in dollars per share) | $ 66.03 | $ 70.99 | $ 67.63 |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |
Granted (in shares) | 12,719 | 11,830 | 12,418 |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per shares) | $ 66.03 | $ 70.99 | $ 67.63 |  |  |  |

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