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Retirement and Share-based Compensation Plans (Schedule of Stock Options Outstanding, By Exercise Price Range) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Options outstanding, intrinsic value | $ 31.2 |  |
Options vested, intrinsic value | 12.6 |  |
Proceeds from stock options exercised | 4.3 | $ 6.7 | $ 6.0
Stock Option Plans For Officers, Directors And Employees |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Options exercised in period, total intrinsic value | $ 3.7 | $ 1.2 | $ 2.2
Exercise Price Range I |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Exercise price range, lower range limit (in dollars per share) | $ 21.89 |  |
Exercise price range, upper range limit (in dollars per share) | $ 26.72 |  |
Stock options outstanding, number of awards (in shares) | 375,820 |  |
Stock options outstanding, remaining life (yrs) | 7 years 9 months 29 days |  |
Stock options outstanding, weighted-average exercise price per share (in dollars per share) | $ 26.07 |  |
Stock options vested, number of awards (in shares) | 126,224 |  |
Stock options vested, remaining life (yrs) | 8 years 3 days |  |
Stock options vested, weighted-average exercise price per share (in dollars per share) | $ 26.72 |  |
Exercise Price Range II |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Exercise price range, lower range limit (in dollars per share) | 27.05 |  |
Exercise price range, upper range limit (in dollars per share) | $ 32.58 |  |
Stock options outstanding, number of awards (in shares) | 1,410,974 |  |
Stock options outstanding, remaining life (yrs) | 8 years 1 month 6 days |  |
Stock options outstanding, weighted-average exercise price per share (in dollars per share) | $ 28.74 |  |
Stock options vested, number of awards (in shares) | 606,322 |  |
Stock options vested, remaining life (yrs) | 8 years 1 month 2 days |  |
Stock options vested, weighted-average exercise price per share (in dollars per share) | $ 28.71 |  |
Exercise Price Range, All Options |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Exercise price range, lower range limit (in dollars per share) | 21.89 |  |
Exercise price range, upper range limit (in dollars per share) | $ 32.58 |  |
Stock options outstanding, number of awards (in shares) | 1,786,794 |  |
Stock options outstanding, remaining life (yrs) | 8 years 18 days |  |
Stock options outstanding, weighted-average exercise price per share (in dollars per share) | $ 28.18 |  |
Stock options vested, number of awards (in shares) | 732,546 |  |
Stock options vested, remaining life (yrs) | 8 years 29 days |  |
Stock options vested, weighted-average exercise price per share (in dollars per share) | $ 28.37 |  |

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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128089324&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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