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Stock-Based Compensation (Compensation Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 31.5 | $ 35.0 | $ 30.2
Tax benefit related to stock-based compensation expense | 4.0 | 2.4 | 2.6
Unrecognized compensation cost related to non-vested stock-based compensation arrangements | $ 31.0 |  |
Unrecognized compensation cost expected to be recognized over weighted average period (in years) | 1 year 6 months 29 days |  |
Tax benefits related to stock options exercised and vesting of restricted stock and RSUs | $ 9.7 | 17.2 | 4.3
Restricted Stock Units (RSUs) [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 31.5 | 35.0 | 30.0
Stock Options [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 0.0 | 0.0 | 0.1
Restricted Stock [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 0.0 | $ 0.0 | $ 0.1

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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