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Debt 2023 Hedge (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Nov. 30, 2018
Debt Instrument [Line Items] |  |
Additional paid in capital recognized for convertible note hedge | $ (218.9) |
Convertible Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Additional paid in capital recognized for convertible note hedge | 171.6 |
Senior Notes | Convertible Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Convertible note hedge, price per share (in USD per share) |  | $ 164.29
Designated as Hedging Instrument | Senior Notes | Convertible Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Convertible note hedge, number of shares (in shares) |  | 5,200,000.0
Convertible note hedge, price per share (in USD per share) |  | $ 164.29
Additional paid in capital recognized for convertible note hedge | $ 218.9 |

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- Definition Debt Instrument, Convertible, Associated Derivative Transactions, Number of Shares1 + References No definition available. + Details
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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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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. + References No definition available. + Details
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- Details
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- Details
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- Details
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