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Goodwill and Other Intangible Assets - Schedule of Goodwill by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |
Beginning balance | $ 2,553.0 | $ 2,462.8
Foreign currency translation | 9.9 | 11.7
Ending balance | 2,595.9 | 2,553.0
Corporate |  |
Goodwill [Roll Forward] |  |
Beginning balance | 1,090.6 | 1,074.1
Foreign currency translation | 0.0 | 0.0
Ending balance | 1,123.6 | 1,090.6
Accumulated impairment losses | 1,571.0 |
Small Business |  |
Goodwill [Roll Forward] |  |
Beginning balance | 185.9 | 185.9
Foreign currency translation | 0.0 | 0.0
Ending balance | 185.9 | 185.9
Public |  |
Goodwill [Roll Forward] |  |
Beginning balance | 929.6 | 929.6
Foreign currency translation | 0.0 | 0.0
Ending balance | 929.6 | 929.6
Accumulated impairment losses | 354.0 |
Other |  |
Goodwill [Roll Forward] |  |
Beginning balance | 346.9 | 273.2
Foreign currency translation | 9.9 | 11.7
Ending balance | 356.8 | 346.9
Accumulated impairment losses | 28.0 |
Scalar acquisition |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 62.0
Scalar acquisition | Corporate |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Scalar acquisition | Small Business |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Scalar acquisition | Public |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Scalar acquisition | Other |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 62.0
Other acquisition |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 16.5
Other acquisition | Corporate |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 16.5
Other acquisition | Small Business |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Other acquisition | Public |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0.0
Other acquisition | Other |  |
Goodwill [Roll Forward] |  |
Acquisition |  | $ 0.0
IGNW, Inc. |  |
Goodwill [Roll Forward] |  |
Acquisition | 33.0 |
IGNW, Inc. | Corporate |  |
Goodwill [Roll Forward] |  |
Acquisition | 33.0 |
IGNW, Inc. | Small Business |  |
Goodwill [Roll Forward] |  |
Acquisition | 0.0 |
IGNW, Inc. | Public |  |
Goodwill [Roll Forward] |  |
Acquisition | 0.0 |
IGNW, Inc. | Other |  |
Goodwill [Roll Forward] |  |
Acquisition | $ 0.0 |

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