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Stock-Based Compensation Plans (Information Regarding Restricted Shares) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
General vesting period (years) | 3 years |  |
Unearned compensation costs | $ 24.2 | $ 18.7 |
Recognition of unearned compensation, (years) | 1 year |  |
Fair value of Restricted Shares vested | $ 25.2 | 26.4 | $ 16.8
Stock-based compensation expense | 29.5 | 27.3 | 23.9
Related income tax benefit | (6.7) | (6.2) | (5.4)
Net stock-based compensation expense | $ 22.8 | $ 21.1 | $ 18.5
Shares |  |  |
Outstanding — beginning of year (in shares) | 1,373,657 |  |
Granted (in shares) | 1,058,836 |  |
Vested (in shares) | (569,362) |  |
Canceled (in shares) | (192,120) |  |
Outstanding — ending of year (in shares) | 1,671,011 | 1,373,657 |
Weighted Average Grant-Date Fair Value |  |  |
Outstanding — beginning of year (in dollars per share) | $ 46.76 |  |
Granted (in dollars per share) | 39.46 |  |
Vested (in dollars per share) | 44.22 |  |
Canceled (in dollars per share) | 46.28 |  |
Outstanding — ending of year (in dollars per share) | $ 43.06 | $ 46.76 |
Restricted Stock | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
General expiration period, from date of grant or time of termination (years) | 1 year |  |
General vesting period (years) | 1 year |  |
Restricted Stock | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
General expiration period, from date of grant or time of termination (years) | 3 years |  |
General vesting period (years) | 3 years |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
General vesting period (years) | 36 months |  |
Shares |  |  |
Outstanding — ending of year (in shares) | 506,000 |  |
Weighted Average Grant-Date Fair Value |  |  |
Total shareholder return performance measure, as a percentage | 15.00% |  |
Estimated vesting of shares based on performance shares | 312,000 |  |
Performance Shares | Minimum |  |  |
Weighted Average Grant-Date Fair Value |  |  |
Estimated vesting of shares based on performance shares | 0 |  |
Performance Shares | Minimum | Issue Date, 2019 and 2020 |  |  |
Weighted Average Grant-Date Fair Value |  |  |
Vesting percentage of grants, depending on achievement of specific performance targets | 0.00% |  |
Performance Shares | Maximum |  |  |
Weighted Average Grant-Date Fair Value |  |  |
Estimated vesting of shares based on performance shares | 1,054,000 |  |
Performance Shares | Maximum | Issue Date, 2019 and 2020 |  |  |
Weighted Average Grant-Date Fair Value |  |  |
Vesting percentage of grants, depending on achievement of specific performance targets | 200.00% |  |
Performance Shares | Maximum | Issued in 2021 |  |  |
Weighted Average Grant-Date Fair Value |  |  |
Vesting percentage of grants, depending on achievement of specific performance targets | 230.00% |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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