Fair Value of Assets and Liabilities - Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Total	$ 20.9	$ 53.3
Fair value liabilities measured on recurring basis
Total	11.4	13.0
Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Total	16.2	39.8
Fair value liabilities measured on recurring basis
Total	6.2	6.3
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Total	4.7	13.5
Fair value liabilities measured on recurring basis
Total	5.2	6.7
Foreign exchange forward contracts \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Foreign exchange forward contracts	2.9	3.4
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	2.9	3.1
Foreign exchange forward contracts \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.0	0.0
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	0.0	0.0
Foreign exchange forward contracts \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	2.9	3.4
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	2.9	3.1
Interest Rate Swap \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.1	4.8
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	2.3	3.6
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.0	0.0
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	0.0	0.0
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.1	4.8
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	2.3	3.6
Certificates of deposit \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	10.0	33.5
Certificates of deposit \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	10.0	33.5
Certificates of deposit \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	0.0	0.0
Assets held in rabbi trusts
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	6.2	6.3
Assets held in rabbi trusts \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Assets held in rabbi trusts	6.2	6.3
Fair value liabilities measured on recurring basis
Deferred compensation	6.2	6.3
Assets held in rabbi trusts \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Assets held in rabbi trusts	6.2	6.3
Fair value liabilities measured on recurring basis
Deferred compensation	6.2	6.3
Assets held in rabbi trusts \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	0.0	0.0
Fair value liabilities measured on recurring basis
Deferred compensation	0.0	0.0
Other Current Assets [Member] \| Interest Rate Swap \| Fair Value, Measurements, Recurring
Fair value assets measured on recurring basis
Foreign exchange forward contracts	1.7	5.3
Other Current Assets [Member] \| Interest Rate Swap \| Fair Value, Measurements, Recurring \| Level 1
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0.0	0.0
Other Current Assets [Member] \| Interest Rate Swap \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	$ 1.7	$ 5.3

Fair value of assets held under trust.

No definition available.

Name:	dbd_FairValueOfAssetsHeldUnderTrust
Namespace Prefix:	dbd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

Name:	us-gaap_DerivativeAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

+ Details

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of obligations measured on a recurring basis.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of financial and nonfinancial obligations.

+ References

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=dbd_AssetsHeldInRabbiTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: