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Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  | 12 Months Ended | 132 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 10, 2022 | Sep. 08, 2022 | May 10, 2022 | Feb. 24, 2022 | Feb. 23, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grants in period |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 45.0 | $ 43.0 | $ 39.0 |
Income tax benefit recorded |  |  |  |  |  | 4.0 | 8.0 | 7.0 |
Additional paid-in capital due to tax benefit from dividends on restricted shares |  |  |  |  |  | 0.6 | 0.6 | 0.6 |
Unrecognized compensation cost |  |  |  |  |  | 97.0 |  |  |
Tax benefit from stock options vested |  |  |  |  |  | 9.0 | 8.0 | 9.0 |
Fair value of shares vested |  |  |  |  |  | $ 40.0 | $ 38.0 | $ 39.0 |
Unrecognized compensation cost expected to be recognized over a weighted-average period, years |  |  |  |  |  | 3 years 3 months 18 days |  |  |
2020 Employee Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  | 1,400,000 |  |  | 1,400,000
Remaining shares |  |  |  |  |  | 996,076 |  |  |
2009 Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  | 37,439 |  |  | 37,439
Remaining shares |  |  |  |  |  | 34,957 |  |  |
2003 Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  | 500,000 |  |  | 500,000
Remaining shares |  |  |  |  |  | 299,461 |  |  |
Non-Employee Directors [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common shares, issued |  |  |  |  |  | 774 | 506 | 593 | 774
Aggregate value of issuances |  |  |  |  |  | $ 0.2 | $ 0.1 | $ 0.1 |
Options and Restricted Shares [Member] | 2020 Employee Plan, 2010 Employee Plan and 2002 Employee Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period, years |  |  |  |  |  | 5 years |  |  |
Options and Restricted Shares [Member] | 2020 Employee Plan, 2010 Employee Plan and 2002 Employee Plan [Member] | Share Based Compensation Award Tranche One [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 20.00% |  |  |
Options and Restricted Shares [Member] | 2009 Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expiration period, in years |  |  |  |  |  | 10 years |  |  |
Options and Restricted Shares [Member] | 2003 Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period, years |  |  |  |  |  | 3 years |  |  |
Options and Restricted Shares [Member] | 2003 Director Plan [Member] | Share Based Compensation Award Tranche One [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.00% |  |  |
Options and Restricted Shares [Member] | Non-Employee Directors [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock acquired for net-share settlement |  |  |  |  |  | 69,833 | 79,308 | 66,289 |
Common stock values of shares acquired for net-share settlement |  |  |  |  |  | $ 21.0 | $ 18.0 | $ 18.0 |
Restricted Shares [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grants in period |  |  |  |  |  | 203,598 |  |  |
Weighted-average grant-date fair value of options granted | $ 323.085 | $ 283.7225 | $ 280.98 | $ 287.9425 | $ 301.535 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grants in period |  |  |  |  | 18,340 |  |  |  |
Weighted-average grant-date fair value of options granted |  |  |  |  | $ 301.5350 |  |  |  |
Performance Shares [Member] | 2020 Employee Plan and 2010 Employee Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period, years |  |  |  |  |  | 3 years |  |  |
Performance Shares [Member] | 2020 Employee Plan and 2010 Employee Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares of stock per unit awarded |  |  |  |  |  | 1.75 |  |  |
Performance Shares [Member] | 2020 Employee Plan and 2010 Employee Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares of stock per unit awarded |  |  |  |  |  |  |  |  |
Performance Shares [Member] | 2020 Employee Plan and 2010 Employee Plan [Member] | Share Based Compensation Award Tranche One [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 100.00% |  |  |
Performance Shares [Member] | Non-Employee Directors [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock acquired for net-share settlement |  |  |  |  |  | 6,175 | 3,104 | 2,587 |
Common stock values of shares acquired for net-share settlement |  |  |  |  |  | $ 1.7 | $ 0.8 | $ 0.7 |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grants in period |  |  |  |  |  | 0 |  |  | 0
Aggregate intrinsic value of options exercised |  |  |  |  |  | $ 10.0 | 11.0 | 10.0 | $ 10.0
Cash received from the exercised share options |  |  |  |  |  | 4.0 | 6.0 | 5.0 |
Tax benefit from options exercised |  |  |  |  |  | $ 2.0 | $ 3.0 | $ 2.0 |

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