The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Name:	us-gaap_GainLossOnSaleOfInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

General - Sale of Non-Core Assets (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
	Jul. 22, 2020	Mar. 16, 2020	Mar. 31, 2020	Dec. 31, 2020
SourceHOV
Membership interests		$ 40.0
Gain on sale of investments			$ 35.5	$ 35.5
Adjustment of purchase consideration		$ 2.0	$ 2.0
Physical Records Storage Business \| Disposed of by sale not discontinued operations
Gain on sale of investments				$ 8.7
Proceeds from sale of business	$ 12.3