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Stock Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | $ 71.1 | $ 82.7 | $ 84.6
Tax benefit |  | 17.3 | 20.0 | 20.4
Stock-settled awards |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 38.4 | 33.5 | 24.7
Cash-settled awards |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 1.0 | 0.8 | 0.6
Performance-based awards |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 28.6 | 46.7 | 57.5
Employee stock purchase plan |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 1.4 | 1.1 | 0.9
Other |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense | [1] | $ 1.7 | $ 0.6 | $ 0.9
[1] | Represents charges recorded for severance expense related to stock-based compensation awards.

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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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