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Share-Based Compensation (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 | Dec. 31, 2018 shares | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding | $ | $ 65.1 |  |  |  |  |
Weighted average recognition period for unrecognized compensation expense, in years | 1 year 3 months 18 days |  |  |  |  |
Intrinsic value of stock options exercised | $ | $ 54.6 | $ 147.9 | $ 163.0 |  |  |
Nonvested, intrinsic value | $ | $ 60.3 |  |  |  |  |
Number of unissued shares of common stock each DSU represents right to receive (in shares) |  |  |  |  |  | 1
Deferred stock units, outstanding (in shares) | 58,000 | 90,000 |  |  |  |
2018 Stock Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized for grant under share-based incentive plans (in shares) |  |  |  |  | 7,500,000 |
Shares available for grant under share-based incentive plans (in shares) | 6,300,000 |  |  |  |  |
Stock options and stock appreciation rights |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Ratio of shares issued under share-based awards to shares authorized under stock plans |  |  |  |  | 1 |
Awards other than stock options and stock appreciation rights |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Ratio of shares issued under share-based awards to shares authorized under stock plans |  |  |  |  | 2.4 |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Additional vesting period |  |  |  | 2 years |  |
Contractual term |  |  |  | 10 years |  |
Award vesting rights, percentage |  |  |  | 25.00% |  |
Fair value of options vested during period | $ | $ 20.4 | $ 17.3 | 14.6 |  |  |
Restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Additional vesting period |  |  |  | 2 years |  |
Award vesting rights, percentage |  |  |  | 25.00% |  |
Fair value of awards vested during period | $ | $ 32.9 | $ 46.1 | $ 27.9 |  |  |
Vested (in shares) | 66,000 |  |  |  |  |
Deferred stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred stock units, outstanding (in shares) | 58,000 | 90,000 |  |  |  |
Vested (in shares) | 33,000 |  |  |  |  |
1997 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized for grant under share-based incentive plans (in shares) | 4,700,000 |  |  |  |  |
Shares available for grant under share-based incentive plans (in shares) | 1,000,000 |  |  |  |  |
Discount from market value for employee stock purchase rights | 15.00% |  |  |  |  |
Common stock issued in connection with the Employee Stock Purchase Plan (in shares) | 44,600 | 29,500 | 39,000 |  |  |
Share-based Compensation Award, Tranche One | Stock options granted to employees with ratable vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 5 years |  |
Share-based Compensation Award, Tranche One | Restricted stock units granted to employees with ratable vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 5 years |  |
Share-based Compensation Award, Tranche Two | Stock options granted to employees with ratable vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |
Share-based Compensation Award, Tranche Two | Restricted stock units granted to employees with ratable vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |

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