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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 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Cash and cash equivalents: |  |
Amortized cost | $ 105.2 | $ 258.4
Estimated fair value | 105.2 | 258.4
Total |  |
Amortized cost | 286.0 | 398.9
Gross unrealized holding gains | 0.0 | 0.1
Gross unrealized holding losses | (2.4) | (0.2)
Estimated fair value | 283.6 | 398.8
Corporate bonds and notes |  |
Available-for-sale: |  |
Amortized cost | 96.5 | 105.7
Gross unrealized holding gains | 0.0 | 0.1
Gross unrealized holding losses | (1.5) | (0.2)
Estimated fair value | 95.0 | 105.6
Municipal bonds |  |
Available-for-sale: |  |
Amortized cost | 31.1 | 16.1
Gross unrealized holding gains | 0.0 | 0.0
Gross unrealized holding losses | (0.2) | 0.0
Estimated fair value | 30.9 | 16.1
Federal agency issues |  |
Available-for-sale: |  |
Amortized cost | 21.9 | 6.8
Gross unrealized holding gains | 0.0 | 0.0
Gross unrealized holding losses | (0.4) | 0.0
Estimated fair value | 21.5 | 6.8
US government securities |  |
Available-for-sale: |  |
Amortized cost | 31.3 | 11.9
Gross unrealized holding gains | 0.0 | 0.0
Gross unrealized holding losses | (0.3) | 0.0
Estimated fair value | 31.0 | 11.9
Cash |  |
Cash and cash equivalents: |  |
Amortized cost | 81.1 | 195.2
Estimated fair value | 81.1 | 195.2
Cash equivalents |  |
Cash and cash equivalents: |  |
Amortized cost | 24.1 | 63.2
Estimated fair value | $ 24.1 | $ 63.2

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