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Cash, Cash Equivalents and Short-Term Investments - Contractual Maturities (Details) $ in Millions	Mar. 31, 2022 USD ($)
Amortized cost
Due within one year	$ 304.2
Due between one to three years	466.6
Due after three years	312.3
Total	1,083.1
Estimated fair value
Due within one year	303.0
Due between one to three years	453.0
Due after three years	294.1
Total	$ 1,050.1

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