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Stock-Based Compensation Plans - RSUs (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Additional share-based compensation disclosures |  |  |  |  |
Total unrecognized compensation cost |  |  | $ 52.9 |  |
Weighted average recognition period for unrecognized compensation cost (in years) |  |  | 1 year 4 months 24 days |  |
RSUs, 2019 grant |  |  |  |  |
Shares |  |  |  |  |
Awards granted (in shares) |  |  | 488,345 |  |
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). |  |  | 194,155 |  |
Fair value of restricted stock granted (in dollars per share) |  |  | $ 88.05 |  |
Share of common stock |  |  | 1 |  |
Changes |  |  |  |  |
Granted (in shares) |  |  | 488,345 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |
Granted (in dollars per share) |  |  | $ 88.05 |  |
RSUs, 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 share) |  |  |  | $ 84.26 |
RSUs, 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 share) |  |  |  |  | $ 79.60
Unvested RSUs |  |  |  |  |
Shares |  |  |  |  |
Awards granted (in shares) |  |  | 488,345 |  |
Fair value of restricted stock granted (in dollars per share) |  |  | $ 88.05 |  |
Changes |  |  |  |  |
Unvested at the beginning of the year (in shares) |  | 859,005 | 889,830 |  |
Granted (in shares) |  |  | 488,345 |  |
Vested (in shares) |  |  | (476,634) |  |
Cancelled or forfeited (in shares) |  |  | (42,536) |  |
Unvested at the end of the year (in shares) |  |  | 859,005 | 889,830 |
Weighted Average Grant Date Fair Value |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) |  | $ 86.40 | $ 82.05 |  |
Granted (in dollars per share) |  |  | 88.05 |  |
Vested (in dollars per share) |  |  | 80.18 |  |
Cancelled or forfeited (in dollars per share) |  |  | 83.97 |  |
Unvested at the end of the year (in dollars per share) |  |  | $ 86.40 | $ 82.05 |
Additional share-based compensation disclosures |  |  |  |  |
Fair value of vested units |  |  | $ 56.5 | $ 34.6 | $ 40.1
Restricted stock |  |  |  |  |
Shares |  |  |  |  |
Payments to tax authorities on employees' behalf for shares withheld related to share settlements |  |  | $ 16.2 | $ 12.3 | $ 9.3
Performance-based | RSU's |  |  |  |  |
Shares |  |  |  |  |
Performance target period (in years) | 3 years | 3 years | 3 years |  |
Directors Equity Plan | Stock Awards |  |  |  |  |
Shares |  |  |  |  |
Awards granted (in shares) |  |  | 11,640 | 13,880 | 18,120
Fair value of restricted stock granted (in dollars per share) |  |  | $ 89.34 | $ 93.65 | $ 71.73
Changes |  |  |  |  |
Granted (in shares) |  |  | 11,640 | 13,880 | 18,120
Weighted Average Grant Date Fair Value |  |  |  |  |
Granted (in dollars per share) |  |  | $ 89.34 | $ 93.65 | $ 71.73

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