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v3.20.2

Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 20, 2020 | May 20, 2020 | Oct. 23, 2018 | Mar. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |
Increase in authorized number of shares to be repurchased |  |  | 5,000,000.0 |  |  |  |  |  |  |  |  |
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan |  |  |  |  | 3,100,000 |  |  |  |  |  | 3,100,000 |
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan, expressed as a percentage of outstanding shares (as a percent) |  |  |  |  | 5.00% |  |  |  |  |  | 5.00% |
Share repurchases (in shares) |  |  |  |  | 2,466 |  |  | 0 |  |  | 3,300,000 | 600,000
Average costs per share |  |  |  |  | $ 100.00 |  |  |  |  |  | $ 90.10 | $ 84.33
Value of shares repurchased |  |  |  |  | $ 0.2 |  | $ 300.0 |  | $ 50.0 |  | $ 300.2 | $ 50.0
Dividends |  |  |  |  |  |  |  |  |  |  |  |
Common stock quarterly dividend per share (in dollars per share) | $ 0.625 |  |  |  | $ 0.625 | $ 0.625 | $ 0.625 | $ 0.55 | $ 0.55 | $ 0.55 |  |
Common stock dividend quarterly declared and paid per share (in dollars per share) |  |  |  |  | $ 0.625 |  |  | $ 0.55 |  |  | $ 1.875 | $ 1.65
Dividends paid |  |  |  |  | $ 39.8 |  |  | $ 36.7 |  |  | $ 120.7 | $ 110.6
Directors Equity Plan |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Extension period of plan |  | 10 years |  |  |  |  |  |  |  |  |  |
Common Stock and Additional Paid in Capital |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |
Value of shares repurchased |  |  |  |  | $ 0.2 |  | $ 119.3 |  | $ 50.0 |  |  |
Common Stock and Additional Paid-In (in Shares) |  |  |  |  |  |  |  |  |  |  |  |
Payments made to tax authorities on employees' behalf |  |  |  |  |  |  |  |  |  |  | 14.9 | 9.6
RSU's |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |
Dividend equivalents paid |  |  |  |  |  |  |  |  |  |  | $ 2.1 | $ 2.7
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  |  |  |  |  | 3 years |
RSU's | Service-based |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  | 3 years |  |  |  |  |  |  |  |
Changes |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 330,144 |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 82.81 |  |  |  |  |  |  |  |
RSU's | Performance-based |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  | 3 years |  |  |  |  |  |  |  |
Changes |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 210,403 |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 82.81 |  |  |  |  |  |  |  |
Unvested RSUs |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Increase in number of shares available for issuance under the plan (in shares) |  | 1,500,000 |  |  |  |  |  |  |  |  |  |
Changes |  |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) |  |  |  |  |  |  | 859,005 |  |  |  | 859,005 |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  | 540,547 |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  | (4,925) |
Cancelled or forfeited (in shares) |  |  |  |  |  |  |  |  |  |  | (25,466) |
Unvested at the end of the period (in shares) |  |  |  |  | 1,369,161 |  |  |  |  |  | 1,369,161 |
Shares reserved for future grants (all plans) |  |  |  |  | 2,104,770 |  |  |  |  |  | 2,104,770 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) |  |  |  |  |  |  | $ 86.40 |  |  |  | $ 86.40 |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  | 82.81 |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  | 85.40 |
Cancelled or forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  | 85.39 |
Unvested at the end of the period (in dollars per share) |  |  |  |  | $ 85.01 |  |  |  |  |  | $ 85.01 |

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