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Stock-Based Compensation Plans - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Additional share-based compensation disclosures |  |  |  |  |
Total unrecognized compensation cost |  |  |  | $ 34.6 |
Weighted average recognition period for unrecognized compensation cost (in years) | 1 year 1 month 13 days |  |  |  |
Restricted stock, 2016 grant |  |  |  |  |
Restricted Shares |  |  |  |  |
Awards granted (in shares) | 512,895 |  |  |  |
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). |  |  |  | 190,175 |
Fair value of restricted stock granted (in dollars per share) | $ 69.16 |  |  |  |
Share of common stock | 1 |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |
Granted (in shares) | 512,895 |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |
Granted (in dollars per shares) | $ 69.16 |  |  |  |
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 and RSUs |  |  |  |  |
Restricted Shares |  |  |  |  |
Awards granted (in shares) | 524,746 |  |  |  |
Fair value of restricted stock granted (in dollars per share) | $ 69.20 |  |  |  |
Number of shares unvested and outstanding | 900,410 | 900,410 |  | 985,540 | 900,410
Changes in unvested restricted stock grants and RSUs |  |  |  |  |
Unvested at the beginning of the year (in shares) | 900,410 |  |  |  |
Granted (in shares) | 524,746 |  |  |  |
Forfeited (in shares) | (93,814) |  |  |  |
Vested (in shares) | (345,802) |  |  |  |
Unvested at the end of the year (in shares) | 985,540 | 900,410 |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) | $ 63.26 |  |  |  |
Granted (in dollars per shares) | 69.20 |  |  |  |
Forfeited (in dollars per shares) | 67.90 |  |  |  |
Vested (in dollars per shares) | 67.96 |  |  |  |
Unvested at the end of the year (in dollars per shares) | $ 64.34 | $ 63.26 |  |  |
Restricted stock |  |  |  |  |
Restricted Shares |  |  |  |  |
Payments to tax authorities on employees' behalf for shares withheld related to share settlements | $ 6.4 | $ 4.5 | $ 0.5 |  |
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) | 11,851 | 12,719 | 11,830 |  |
Fair value of restricted stock granted (in dollars per share) | $ 70.88 | $ 66.03 | $ 70.99 |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |
Granted (in shares) | 11,851 | 12,719 | 11,830 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |
Granted (in dollars per shares) | $ 70.88 | $ 66.03 | $ 70.99 |  |

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