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Stock-Based Compensation Plans - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Additional share-based compensation disclosures |  |  |
Total unrecognized compensation cost | $ 48.8 |  |
Weighted average recognition period for unrecognized compensation cost (in years) | 1 year 4 months 6 days |  |
Restricted stock, 2018 grant |  |  |
Shares |  |  |
Awards granted (in shares) | 474,715 |  |
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). | 178,970 |  |
Fair value of restricted stock granted (in dollars per share) | $ 84.26 |  |
Share of common stock | 1 |  |
Changes |  |  |
Granted (in shares) | 474,715 |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per shares) | $ 84.26 |  |
Restricted stock, 2017 grant |  |  |
Shares |  |  |
Awards granted (in shares) |  | 446,525 |
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). |  | 169,009 |
Fair value of restricted stock granted (in dollars per share) |  | $ 79.60 |
Share of common stock |  | 1 |
Changes |  |  |
Granted (in shares) |  | 446,525 |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per shares) |  | $ 79.60 |
Restricted stock, 2016 grant |  |  |
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 |  |  |
Granted (in shares) |  |  | 512,895
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per shares) |  |  | $ 69.16
Restricted stock and RSUs |  |  |
Shares |  |  |
Awards granted (in shares) | 474,715 |  |
Fair value of restricted stock granted (in dollars per share) | $ 84.26 |  |
Changes |  |  |
Unvested at the beginning of the period (in shares) | 924,575 |  |
Granted (in shares) | 474,715 |  |
Vested (in shares) | (484,858) |  |
Cancelled or forfeited (in shares) | (24,602) |  |
Unvested at the end of the period (in shares) | 889,830 | 924,575 |
Weighted Average Grant Date Fair Value |  |  |
Unvested at the beginning of the period (in dollars per share) | $ 74.09 |  |
Granted (in dollars per shares) | 84.26 |  |
Vested (in dollars per shares) | 69.32 |  |
Cancelled or forfeited (in dollars per shares) | 76.72 |  |
Unvested at the end of the period (in dollars per shares) | $ 82.05 | $ 74.09 |
Restricted stock |  |  |
Shares |  |  |
Payments to tax authorities on employees' behalf for shares withheld related to share settlements | $ 12.3 | $ 9.3 | $ 6.4
Performance-based | RSU's |  |  |
Shares |  |  |
Performance target period (in years) | 3 years |  |
Directors Equity Plan | Stock Awards |  |  |
Shares |  |  |
Awards granted (in shares) | 13,880 | 18,120 | 11,851
Fair value of restricted stock granted (in dollars per share) | $ 93.65 | $ 71.73 | $ 70.88
Changes |  |  |
Granted (in shares) | 13,880 | 18,120 | 11,851
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per shares) | $ 93.65 | $ 71.73 | $ 70.88

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