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Cash, Cash Equivalents and Short-Term Investments - Contractual Maturities of Short Term Investments (Details) $ in Millions	Mar. 31, 2019 USD ($)
Amortized cost
Due within one year	$ 337.9
Due between one to three years	217.6
Total	555.5
Estimated fair value
Due within one year	338.1
Due between one to three years	217.9
Total	$ 556.0

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Available For Sale Securities, Debt Maturities After One Through Four Years, Amortized Cost

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