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Acquisitions and Divestitures - Purchase Price Allocation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Cash paid for acquisition of business | $ 128.6 | $ 0.0 | $ 21.3
Universal Weather and Aviation, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Cash paid for acquisition of business | 129.0 |  |
Amounts due to sellers | 30.0 |  |
Purchase price | 159.0 |  |
Assets acquired: |  |  |
Accounts receivable | 42.8 |  |
Goodwill and identifiable intangible assets | 123.3 |  |
Other current and long-term assets | 3.8 |  |
Liabilities assumed: |  |  |
Accounts payable | (9.9) |  |
Other current and long-term liabilities | (1.0) |  |
Purchase price | $ 159.0 |  |

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