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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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