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Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 16, 2021 | Sep. 09, 2021 | May 12, 2021 | Feb. 24, 2021 | Feb. 23, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grants in period |  |  |  |  |  |  | 0 |
Share-based compensation expense |  |  |  |  |  | $ 43.4 | $ 39.2 | $ 34.0
Income tax benefit recorded |  |  |  |  |  | 8.0 | 7.1 | 8.4
Additional paid-in capital due to tax benefit from dividends on restricted shares |  |  |  |  |  | 0.6 | 0.6 | 0.5
Unrecognized compensation cost |  |  |  |  |  | 90.9 |  |
Tax benefit from stock options vested |  |  |  |  |  | 7.5 |  |
Fair value of shares vested |  |  |  |  |  | $ 37.9 | $ 38.7 | $ 28.1
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] |  |  |  |  |  |  |  |
Remaining shares |  |  |  |  |  | 1,158,270 |  |
1995 and 2002 Employee Plans [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grants in period |  |  |  |  |  | 0 |  |
2009 Director Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Remaining shares |  |  |  |  |  | 34,957 |  |
2003 Director Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Remaining shares |  |  |  |  |  | 307,378 |  |
Key Employees [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares issued |  |  |  |  |  | 2,922,717 |  |
Restricted shares cancelled |  |  |  |  |  | 411,663 |  |
Non-Employee Directors [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares, issued |  |  |  |  |  | 506 | 593 | 459
Restricted shares issued |  |  |  |  |  | 185,153 |  |
Restricted shares cancelled |  |  |  |  |  | 0 |  |
Aggregate value of issuances |  |  |  |  |  | $ 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 |  |  |  |  |  | 79,308 | 66,289 | 71,437
Common stock values of shares acquired for net-share settlement |  |  |  |  |  | $ 17.8 | $ 17.9 | $ 14.2
Restricted Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grants in period |  |  |  |  |  | 213,901 |  |
Weighted-average grant-date fair value of options granted | $ 277.605 | $ 263.630 | $ 264.845 | $ 244.445 | $ 242.240 |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grants in period |  |  |  |  | 22,205 |  |  |
Weighted-average grant-date fair value of options granted |  |  |  |  | $ 242.240 |  |  |
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 |  |  |  |  |  | 3,104 | 2,587 | 5,008
Common stock values of shares acquired for net-share settlement |  |  |  |  |  | $ 0.8 | $ 0.7 | $ 1.1
Employee Stock Option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grants in period |  |  |  |  |  | 0 | 0 | 0
Aggregate intrinsic value of options exercised |  |  |  |  |  | $ 10.9 | $ 10.0 | $ 16.3
Cash received from the exercised share options |  |  |  |  |  | 5.9 |  |
Tax benefit from options exercised |  |  |  |  |  | $ 2.6 |  |

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