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Goodwill and Acquired Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | [1]
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 629.9 |  | $ 629.9 |  |
Accumulated Amortization | (249.4) |  | (249.4) |  |
Net | 380.5 |  | 380.5 |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 1,696.3 |  | 1,696.3 |  | $ 1,575.1
Amortization expense | 17.9 | $ 16.1 | 52.3 | $ 39.2 |
Pre-Acquisition ZI brand portfolio |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets not subject to amortization | 33.0 |  | 33.0 |  |
Customer relationships |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 287.6 |  | 287.6 |  |
Accumulated Amortization | (87.0) |  | (87.0) |  |
Net | 200.6 |  | $ 200.6 |  |
Weighted Average Amortization Period in Years |  |  | 14 years 4 months 24 days |  |
Acquired technology |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 330.8 |  | $ 330.8 |  |
Accumulated Amortization | (157.0) |  | (157.0) |  |
Net | 173.8 |  | $ 173.8 |  |
Weighted Average Amortization Period in Years |  |  | 6 years 3 months 18 days |  |
Brand portfolio |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 11.5 |  | $ 11.5 |  |
Accumulated Amortization | (5.4) |  | (5.4) |  |
Net | $ 6.1 |  | $ 6.1 |  |
Weighted Average Amortization Period in Years |  |  | 7 years 6 months |  |
[1] | The Condensed Consolidated Balance Sheet as of December 31, 2021 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

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