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Acquisitions and Divestitures - Narrative (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) acquisition | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from sale of business, net of divested cash |  | $ 259.6 | $ 30.8 | $ 0.0 |
Provision for income taxes |  | 52.1 | 56.2 | 55.9 | $ 149.2
Acquisitions |  |  |  |  |
Goodwill |  | 858.6 | $ 843.7 | $ 852.7 |
Universal Weather and Aviation, Inc. |  |  |  |  |
Acquisitions |  |  |  |  |
Goodwill |  | 79.1 |  |  |
Goodwill, expected to be tax deductible |  | 70.2 |  |  |
Number of business acquired | acquisition |  |  |  | 1 |
Universal Weather and Aviation, Inc. | Customer relationships |  |  |  |  |
Acquisitions |  |  |  |  |
Identifiable intangible assets acquired |  | 44.3 |  |  |
Disposal Group, Not Discontinued Operations | Multi Service Payment Solutions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from sale of business, net of divested cash |  | $ 303.5 |  |  |
Proceeds from divestiture of businesses, net of cash divested | $ 259.6 |  |  |  |
Deferred future payment from sale of business | 75.0 |  |  |  |
Deferred future payment from sale of business, portion based on future business performance | 50.0 |  |  |  |
Gain (loss) on sale of investments | 80.0 |  |  |  |
Provision for income taxes | $ 12.9 |  |  |  |

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