The Company and Summary of Significant Accounting Policies - Concentrations of Risk Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Customer concentration risk \| Gross accounts receivable
Concentration Risk [Line Items]
Percentage of gross accounts receivable (as a percent)	88.00%	89.00%
Customer concentration risk \| Gross accounts receivable \| Express Scripts
Concentration Risk [Line Items]
Percentage of gross accounts receivable (as a percent)	81.00%	77.00%
Customer concentration risk \| Gross accounts receivable \| McKesson
Concentration Risk [Line Items]
Percentage of gross accounts receivable (as a percent)	7.00%	12.00%
Foreign exchange forward contracts \| Derivatives not designated as hedging instruments
Concentration Risk [Line Items]
Notional amount	$ 225,400,000	$ 180,900,000
Net liability fair value	3,600,000
Interest rate contracts \| Derivatives designated as hedging instruments
Concentration Risk [Line Items]
Notional amount	300,000,000.0	$ 300,000,000
Net liability fair value	$ 6,200,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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