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Balance Sheet Details and Other Financial Information - Schedule of Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Non-marketable equity securities	$ 119.3	$ 38.5
Long-term deposits	13.8	14.4
Other assets	39.9	22.1
Total other assets	$ 173.0	$ 75.0

X

- Definition

Long -Term Deposits

+ References

No definition available.

+ Details

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Namespace Prefix:	dxcm_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Other Long -Term Assets

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- References

No definition available.

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- Definition

Amount of noncurrent assets classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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