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Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, gross at beginning of period	$ 906.5	$ 775.4
Accumulated impairment losses	(675.0)	(674.9)
Goodwill, net at beginning of period	231.5	100.5
Additions	94.6	131.1
Currency translation	(0.6)	(0.1)
Goodwill, gross at end of period	998.9	906.5
Accumulated impairment losses	(673.4)	(675.0)
Goodwill, net at end of period	$ 325.5	$ 231.5

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.

+ References

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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