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Goodwill and Other Intangible Assets - Schedule of Goodwill by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |
Beginning balance | $ 4,382.9 | $ 2,595.9
Foreign currency translation | (34.4) | (2.1)
Ending balance | 4,342.7 | 4,382.9
Corporate |  |
Goodwill [Roll Forward] |  |
Beginning balance | 2,024.4 | 1,123.6
Foreign currency translation | 0.0 | 0.0
Ending balance | 2,133.4 | 2,024.4
Accumulated impairment losses | 1,571.0 |
Small Business |  |
Goodwill [Roll Forward] |  |
Beginning balance | 266.1 | 185.9
Foreign currency translation | 0.0 | 0.0
Ending balance | 230.2 | 266.1
Public |  |
Goodwill [Roll Forward] |  |
Beginning balance | 1,737.7 | 929.6
Foreign currency translation | 0.0 | 0.0
Ending balance | 1,658.8 | 1,737.7
Accumulated impairment losses | 354.0 |
Other |  |
Goodwill [Roll Forward] |  |
Beginning balance | 354.7 | 356.8
Foreign currency translation | (34.4) | (2.1)
Ending balance | 320.3 | 354.7
Accumulated impairment losses | 28.0 |
Amplified IT LLC |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 133.8
Amplified IT LLC | Corporate |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Amplified IT LLC | Small Business |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Amplified IT LLC | Public |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 133.8
Amplified IT LLC | Other |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Focal Point Data Risk LLC |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 82.7
Focal Point Data Risk LLC | Corporate |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Focal Point Data Risk LLC | Small Business |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Focal Point Data Risk LLC | Public |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 82.7
Focal Point Data Risk LLC | Other |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Sirius Computer Solutions, Inc. |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 1,572.4
Sirius Computer Solutions, Inc. | Corporate |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 900.6
Sirius Computer Solutions, Inc. | Small Business |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 80.2
Sirius Computer Solutions, Inc. | Public |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 591.6
Sirius Computer Solutions, Inc. | Other |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Other acquisition adjustments |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.2
Sirius measurement period adjustment | (5.8) |
Other acquisition adjustments | Corporate |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.2
Sirius measurement period adjustment | 109.0 |
Other acquisition adjustments | Small Business |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Sirius measurement period adjustment | (35.9) |
Other acquisition adjustments | Public |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Sirius measurement period adjustment | (78.9) |
Other acquisition adjustments | Other |  |
Goodwill [Roll Forward] |  |
Acquisition |  | $ 0.0
Sirius measurement period adjustment | $ 0.0 |

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