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Marketable Investment Securities - Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | --- | ---
Cash and cash equivalents: |  |  |  |
Amortized cost | $ 56.9 | $ 257.4 | $ 117.0 | $ 163.7
Estimated fair value | 56.9 | 257.4 |  |
Total: |  |  |  |
Amortized cost | 172.4 | 397.9 |  |
Gross unrealized holding gains | 0.0 | 0.1 |  |
Gross unrealized holding losses | (2.7) | (0.2) |  |
Estimated fair value | 169.7 | 397.8 |  |
Corporate bonds and notes |  |  |  |
Available-for-sale: |  |  |  |
Amortized cost | 66.7 | 105.7 |  |
Gross unrealized holding gains | 0.0 | 0.1 |  |
Gross unrealized holding losses | (1.6) | (0.2) |  |
Estimated fair value | 65.1 | 105.6 |  |
Municipal bonds |  |  |  |
Available-for-sale: |  |  |  |
Amortized cost | 16.3 | 16.1 |  |
Gross unrealized holding gains | 0.0 | 0.0 |  |
Gross unrealized holding losses | (0.3) | 0.0 |  |
Estimated fair value | 16.0 | 16.1 |  |
Federal agency issues |  |  |  |
Available-for-sale: |  |  |  |
Amortized cost | 20.7 | 6.8 |  |
Gross unrealized holding gains | 0.0 | 0.0 |  |
Gross unrealized holding losses | (0.7) | 0.0 |  |
Estimated fair value | 20.0 | 6.8 |  |
U.S. government securities |  |  |  |
Available-for-sale: |  |  |  |
Amortized cost | 11.8 | 11.9 |  |
Gross unrealized holding gains | 0.0 | 0.0 |  |
Gross unrealized holding losses | (0.1) | 0.0 |  |
Estimated fair value | 11.7 | 11.9 |  |
Cash |  |  |  |
Cash and cash equivalents: |  |  |  |
Amortized cost | 53.6 | 194.2 |  |
Estimated fair value | 53.6 | 194.2 |  |
Cash equivalents |  |  |  |
Cash and cash equivalents: |  |  |  |
Amortized cost | 3.3 | 63.2 |  |
Estimated fair value | $ 3.3 | $ 63.2 |  |

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