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Investments - Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Investments [Abstract] |  |  |
Short-term investments | $ 4,000,000 |  | $ 1,295,300,000
Adjusted Cost |  |  | 1,292,500,000
Marketable equity securities | 1,700,000 |  | 2,800,000
Sales of available-for-sale investments | 1,376,600,000 | $ 0 |
Available-for-sale securities, recognized losses | 5,600,000 |  |
Loss on marketable equity securities | $ 1,200,000 |  |
Other than temporary impairment losses, available-for-sale securities |  |  | $ 15,500,000

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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