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Related Party Transactions - Agreements with Carl Icahn (Details) - Nomination and Standstill Agreement - Icahn Group - shares		3 Months Ended
	Sep. 15, 2014	Mar. 31, 2019
Related Party Transaction [Line Items]
Ownership percentage limit (more than)	20.00%
Net long position shares held, tranche one (at least) (in shares)		1,900,000

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- Definition

Related Party Transaction, Ownership Percentage Limitation

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- Definition

Related Party Transactions, Minimum Shares Held, Tranche 1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Details

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- Details

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