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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ (10.9) | $ 1.4 | $ (9.8) | $ 3.2
Restricted Stock [Member] |  |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | (8.3) | 0.5 | (7.9) | 1.1
Restricted Stock Units [Member] |  |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ (2.6) | $ 0.9 | $ (1.9) | $ 2.1

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