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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) - USD ($) $ in Millions | 3 Months Ended | 18 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Jun. 30, 2021
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 9.1 | $ 1.1 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 770,500
Total | 97.5 |  |
Equity Option [Member] |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 8.5 | 0.0 |
Restricted Stock Units [Member] |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 0.6 | 0.7 |
Restricted Stock [Member] |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 0.0 | $ 0.4 |

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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