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Stock-Based Compensation (Compensation Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 31.1 | $ 25.5 | $ 20.6
Tax benefit related to stock-based compensation expense | 2.5 | 3.0 | 7.8
Unrecognized compensation cost related to non-vested stock-based compensation arrangements | $ 20.1 |  |
Unrecognized compensation cost expected to be recognized over weighted average period (in years) | 1 year 8 months 26 days |  |
Tax benefits related to stock options exercised and vesting of restricted stock and RSUs | $ 3.3 | 3.4 | 6.2
Restricted Stock Units (RSUs) [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 29.4 | 21.7 | 14.2
Unrecognized compensation cost related to non-vested stock-based compensation arrangements | 19.9 |  |
Stock Options [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 0.9 | 1.6 | 3.1
Unrecognized compensation cost related to non-vested stock-based compensation arrangements | 0.1 |  |
Restricted Stock [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 0.8 | $ 2.2 | $ 3.3
Unrecognized compensation cost related to non-vested stock-based compensation arrangements | $ 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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