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Divestitures - Narrative (Details) - Discontinued Operations, Disposed of by Sale - MyCase - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Sep. 30, 2020	Jun. 30, 2021	Jun. 30, 2021
Business Acquisition [Line Items]
Consideration for disposal of subsidiary	$ 193.0
Proceeds from divestiture of subsidiary	192.2
Employee retention bonus pool	2.2
Cash divested	0.8
Working capital adjustment	$ 0.6
Retention period	1 year
Gain on sale of subsidiary	$ 188.0
Assets divested	4.6
Adjustment to the employee retention bonus pool	0.4
Capitalized software divested	3.9
Deferred revenue divested	2.8
Goodwill divested	$ 2.3
Income received		$ 0.3	$ 0.7

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