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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Cash and Cash Equivalents and Short-Term Investments |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Cash | $ 328.1 | $ 248.0
Cash and Cash Equivalents and Short-Term Investments | Fair Value Measurements on a Recurring Basis |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Cash | 328.1 | 248.0
Restricted Cash and Cash Equivalents and Restricted Investments |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Restricted cash | 58.0 | 50.2
Restricted Cash and Cash Equivalents and Restricted Investments | Fair Value Measurements on a Recurring Basis |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Restricted cash | 58.0 | 50.2
Prepaid Expenses and Other Current Assets |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Restricted cash | 1.9 | 1.4
Prepaid Expenses and Other Current Assets | Fair Value Measurements on a Recurring Basis |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Restricted cash | $ 1.9 | $ 1.4

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 305 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84242212&loc=d3e2352-115587 + Details
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