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Employee Benefit Plans and Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Intrinsic Value of Options Exercised and Fair Value of Options Vested

The total intrinsic value of stock options exercised as of the date of exercise was as follows:

			Twelve Months Ended December 31,
(In millions)			2020						2019						2018
Intrinsic value of options exercised			$	7.9					$	7.4					$	30.0

Schedule of Restricted Stock Units Activity

A summary of our RSU activity for the twelve months ended December 31, 2020, 2019 and 2018 is as follows:

(In millions except weighted average grant date fair value)			Shares						Weighted  Average Grant Date Fair Value						Aggregate Intrinsic Value
Nonvested at December 31, 2017			2.7						$	70.68
Granted			1.7						66.07
Vested			(1.4)						68.44
Forfeited			(0.3)						68.56
Nonvested at December 31, 2018			2.7						69.19						$	319.0
Granted			0.7						144.37
Vested			(1.4)						69.45
Forfeited			(0.2)						83.45
Nonvested at December 31, 2019			1.8						96.63						392.0
Granted			0.5						300.36
Vested			(1.0)						92.07
Forfeited			(0.1)						137.44
Nonvested at December 31, 2020			1.2						$	183.51					$	430.6

Schedule of Stock Options Reserved for Future Issuance

Shares of common stock reserved for future issuance were as follows as of the dated indicated:

			December 31,
(In millions)			2020						2019
Stock awards under our plans:
Unvested restricted stock units			1.2						1.8
Reserved for future grant			4.5						4.9
Employee Stock Purchase Plan			0.8						0.9
Total			6.5						7.6

Schedule of Share-Based Compensation Expenses

The following table summarizes share-based compensation expense related to restricted stock units and employee stock purchases under the ESPP for the twelve months ended December 31, 2020, 2019 and 2018:

			Twelve Months Ended December 31,
(In millions)			2020						2019						2018
Cost of sales			$	14.6					$	9.0					$	9.2
Research and development			37.8						33.5						33.0
Selling, general and administrative			67.0						60.2						59.7
Total share-based compensation expense			$	119.4					$	102.7					$	101.9

Schedule of Valuation Assumptions for Employee Stock Purchase Plan

We estimate the fair value of ESPP purchase rights on the date of grant using the Black-Scholes option pricing model and the assumptions below for the specified reporting periods.

			Twelve Months Ended December 31,
			2020						2019						2018
Risk free interest rate			0.13 - 0.95						1.72 - 2.55						1.55 - 2.25
Dividend yield			—		%				—		%				—		%
Expected volatility of Dexcom common stock			0.51 - 0.63						0.40 - 0.51						0.50 - 0.67
Expected life (in years)			0.5						1						1

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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