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Divestitures, Investment Activities, and Goodwill - Schedule of Accumulated Impairment Losses of Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Divestitures, Acquisitions, and Goodwill
Goodwill, gross	$ 3,030.6	$ 3,030.6	$ 3,030.6
Accumulated impairment losses	(464.0)	(464.0)	(464.0)
Goodwill, net	2,566.6
Goodwill, net	$ 2,034.6	$ 2,566.6	$ 2,566.6

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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