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Subsequent Events (Narrative) (Details) - USD ($) $ in Millions | Apr. 15, 2018 | May 10, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Coupon rate |  |  | 5.875%
Convertible Senior Subordinated Notes | April 2013 Notes |  |  |
Subsequent Event [Line Items] |  |  |
Coupon rate |  |  | 1.25%
Convertible Senior Subordinated Notes | April 2013 Notes | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Coupon rate | 1.25% |  |
Repayments of convertible debt | $ 60.4 |  |
Principal amount of debt prepaid | $ 60.0 |  |
LIBOR | Interest Rate Swap | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Fixed interest rate |  | 2.915% |
Notional amount |  | $ 1,000.0 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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