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Balance Sheet Details - Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Long-term deposits	$ 24.6	$ 16.2
Other assets	32.0	30.9
Total other assets	$ 56.6	$ 47.1

X

- Definition

Long Term Deposits

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Other Long Term Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	dxcm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- References

No definition available.

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X

- Definition

Amount of noncurrent assets classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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