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Stock-Based Compensation Plans (Information Regarding Restricted Shares) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
General vesting period (years) | 3 years |  |
Unearned compensation costs | $ 18.7 | $ 23.4 |
Recognition of unearned compensation, (years) | 1 year |  |
Fair value of Restricted Shares vested | $ 26.4 | 16.8 | $ 14.3
Stock-based compensation expense | 27.3 | 23.9 | 19.9
Related income tax benefit | (6.2) | (5.4) | (4.5)
Net stock-based compensation expense | $ 21.1 | $ 18.5 | $ 15.4
Shares |  |  |
Outstanding — beginning of year (in shares) | 1,690,600 |  |
Granted (in shares) | 730,065 |  |
Vested (in shares) | (587,301) |  |
Canceled (in shares) | (459,707) |  |
Outstanding — ending of year (in shares) | 1,373,657 | 1,690,600 |
Weighted Average Grant-Date Fair Value |  |  |
Outstanding — beginning of year (in dollars per share) | $ 46.71 |  |
Granted (in dollars per share) | 46.56 |  |
Vested (in dollars per share) | 45.02 |  |
Canceled (in dollars per share) | 48.47 |  |
Outstanding — ending of year (in dollars per share) | $ 46.76 | $ 46.71 |
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) | 539,000 |  |
Weighted Average Grant-Date Fair Value |  |  |
Period for achieving performance targets on performance based units (years) | 3 years |  |
Estimated vesting of shares based on performance shares | 537,000 |  |
Performance Shares | Minimum |  |  |
Weighted Average Grant-Date Fair Value |  |  |
Vesting percentage of grants, depending on achievement of specific performance targets | 0.00% |  |
Estimated vesting of shares based on performance shares | 0 |  |
Performance Shares | Maximum |  |  |
Weighted Average Grant-Date Fair Value |  |  |
Vesting percentage of grants, depending on achievement of specific performance targets | 200.00% |  |
Estimated vesting of shares based on performance shares | 1,078,000 |  |

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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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