Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109222160&loc=d3e957-107759

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721525-107759

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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Name:	us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Dispositions - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
Dispositions - Narrative (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 25, 2019	May 08, 2019
Dispositions [Line Items]
Gain (loss) resulted from disposition of business	$ 0.6	$ 127.4
Disposition by Sale \| Business Services
Dispositions [Line Items]
Cash on disposition of business					$ 11.6
Gain (loss) on disposition of business			$ 6.1
GDS \| Disposition by Sale
Dispositions [Line Items]
Cash on disposition of business				$ 53.7
Gain (loss) resulted from disposition of business			(3.8)
RRD Brazil
Dispositions [Line Items]
Gain (loss) on disposition of business			$ 4.0