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Supplemental Financial Statement Information - Summary of Cash Equivalents and Short-Term Investments (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Cash and Cash Equivalents and Short-Term Investments |  |
Cash And Restricted Cash [Line Items] |  |
Cash | $ 328.1 | $ 248.0
Restricted Cash and Cash Equivalents and Restricted Investments |  |
Cash And Restricted Cash [Line Items] |  |
Restricted cash | 58.0 | 50.2
Prepaid Expenses and Other Current Assets |  |
Cash And Restricted Cash [Line Items] |  |
Restricted cash | $ 1.9 | $ 1.4

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