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Stock-Based Compensation (Intrinsic Value and Tax Deductions of Stock Appreciation Rights) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Realized tax benefits from tax deductions | $ 4.2 | $ 10.9 | $ 10.5
Stock Appreciation Rights (SARs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeiture Rate | 11.80% |  |
Instrinsic value of stock appreciation rights exercised | $ 26.7 | 37.1 | 35.9
Realized tax benefits from tax deductions | $ 6.7 | $ 9.3 | $ 8.9

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