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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, 2021 | Dec. 31, 2020
--- | --- | ---
Cash and cash equivalents: |  |
Cash and cash equivalents, Amortized cost | $ 258.4 | $ 117.0
Cash and cash equivalents, Estimated fair value | 258.4 | 117.0
Total: |  |
Total, Amortized cost | 398.9 | 170.9
Total, Gross unrealized holding gains | 0.1 | 0.8
Total, Gross unrealized holding gains | (0.2) | 0.0
Total, Estimated fair value | 398.8 | 171.7
Cash |  |
Cash and cash equivalents: |  |
Cash and cash equivalents, Amortized cost | 195.2 | 47.9
Cash and cash equivalents, Estimated fair value | 195.2 | 47.9
Cash equivalents |  |
Cash and cash equivalents: |  |
Cash and cash equivalents, Amortized cost | 63.2 | 69.1
Cash and cash equivalents, Estimated fair value | 63.2 | 69.1
Corporate bonds and notes |  |
Available-for-sale: |  |
Available-for-sale, Amortized cost | 105.7 | 28.8
Available-for-sale, Gross unrealized holding gains | 0.1 | 0.5
Available-for-sale, Gross unrealized holding losses | (0.2) | 0.0
Available-for-sale, Estimated fair value | 105.6 | 29.3
Municipal bonds |  |
Available-for-sale: |  |
Available-for-sale, Amortized cost | 16.1 | 9.4
Available-for-sale, Gross unrealized holding gains | 0.0 | 0.2
Available-for-sale, Gross unrealized holding losses | 0.0 | 0.0
Available-for-sale, Estimated fair value | 16.1 | 9.6
Federal agency issues |  |
Available-for-sale: |  |
Available-for-sale, Amortized cost | 6.8 | 4.0
Available-for-sale, Gross unrealized holding gains | 0.0 | 0.0
Available-for-sale, Gross unrealized holding losses | 0.0 | 0.0
Available-for-sale, Estimated fair value | 6.8 | 4.0
US government securities |  |
Available-for-sale: |  |
Available-for-sale, Amortized cost | 11.9 | 11.7
Available-for-sale, Gross unrealized holding gains | 0.0 | 0.1
Available-for-sale, Gross unrealized holding losses | 0.0 | 0.0
Available-for-sale, Estimated fair value | $ 11.9 | $ 11.8

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