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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-tax compensation expense | $ 5.9 | $ 8.2 | $ 11.1 | $ 17.0
Capitalized credit (cost) during the period | 0.1 | (2.6) | 3.4 | (3.8)
Amortization of capitalized (credit) cost during the period | (3.8) | 1.7 | 0.4 | 2.3
Total stock-based compensation expense | 2.2 | 7.3 | 14.9 | 15.5
Stock option awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-tax compensation expense | 2.6 | 2.5 | 5.8 | 5.6
Restricted stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-tax compensation expense | 1.9 | 2.1 | 4.0 | 4.1
Performance share awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-tax compensation expense | 1.7 | 1.5 | 3.8 | 3.1
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-tax compensation expense | 0.0 | 0.0 | 1.4 | 1.3
Stock Appreciation Rights |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-tax compensation expense | $ (0.3) | $ 2.1 | $ (3.9) | $ 2.9

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