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Marketable Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security | The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at June 30, 2022 and December 31, 2021 were as follows:
(in millions) | Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
June 30, 2022 |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 81.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 81.1 |
Cash equivalents | 24.1 |  |  | — |  |  | — |  |  | 24.1 |
Total cash and cash equivalents | 105.2 |  |  | — |  |  | — |  |  | 105.2 |
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 96.5 |  |  | — |  |  | (1.5) |  |  | 95.0 |
Municipal bonds | 31.1 |  |  | — |  |  | (0.2) |  |  | 30.9 |
Federal agency issues | 21.9 |  |  | — |  |  | (0.4) |  |  | 21.5 |
US government securities | 31.3 |  |  | — |  |  | (0.3) |  |  | 31.0 |
Total | $ | 286.0 |  |  | $ | — |  |  | $ | (2.4) |  |  | $ | 283.6 |
(in millions) | Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
December 31, 2021 |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 195.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 195.2 |
Cash equivalents | 63.2 |  |  | — |  |  | — |  |  | 63.2 |
Total cash and cash equivalents | 258.4 |  |  | — |  |  | — |  |  | 258.4 |
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 105.7 |  |  | 0.1 |  |  | (0.2) |  |  | 105.6 |
Municipal bonds | 16.1 |  |  | — |  |  | — |  |  | 16.1 |
Federal agency issues | 6.8 |  |  | — |  |  | — |  |  | 6.8 |
US government securities | 11.9 |  |  | — |  |  | — |  |  | 11.9 |
Total | $ | 398.9 |  |  | $ | 0.1 |  |  | $ | (0.2) |  |  | $ | 398.8 |
Schedule of Cash, Cash Equivalents, and Maturities of Debt Securities Classified as Available-For-Sale Securities | Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities were as follows at June 30, 2022:
(in millions) | Amortized cost |  | Estimated fair value
Cash | $ | 81.1 |  |  | $ | 81.1 |
Cash equivalents | 24.1 |  |  | 24.1 |
Available-for-sale: |  |  |
Due within one year | 100.5 |  |  | 99.9 |
Due after one year through five years | 80.1 |  |  | 78.3 |
Due after five years | 0.2 |  |  | 0.2 |
Total | $ | 286.0 |  |  | $ | 283.6 |

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