Applicable Conversion Price, Percentage

No definition available.

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- Definition

Applicable Conversion Price Threshold, Percentage

+ References

No definition available.

+ Details

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- Definition

Equivalent Shares Of Common Stock Per 1000 Principal Amount Of Convertible Notes

+ References

No definition available.

+ Details

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- Definition

Maximum Days After Any Five Trading Day Period In Which Trading Price Was Less Than 97 Percent Of Last Reported Sale Price of Common Stock Times Conversion Rate

+ References

No definition available.

+ Details

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- Definition

Net Cost Of Convertible Note Hedge And Warrants

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Payments For Call Options Related to Convertible Debt

+ References

No definition available.

+ Details

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- Definition

Percentage Above Sales Price

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Premium Percentage On Shares Issued from Conversion of Convertible Debt

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Period Type:	instant

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

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- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

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- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ 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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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

+ Details

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Debt And Credit Arrangements - 2024 Notes Narratives (Details)		1 Months Ended	3 Months Ended
	Nov. 06, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares	Oct. 31, 2017 $ / shares
Common stock
Debt Instrument
Share price (usd per share) \| $ / shares			$ 59.03
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Debt instrument stated interest rate	1.00%
Debt instrument face amount	$ 258,800,000.0	$ 258,800,000	$ 258,800,000
Share conversion rate per 1,000 principal \| shares	17.0285
Debt instrument, conversion price (usd per share) \| $ / shares	$ 58.725
Debt instrument, conversion premium	35.00%
Share price (usd per share) \| $ / shares				$ 43.50
Debt instrument, excess over fair value if converted			$ 1,300,000
Debt instrument, threshold for consecutive trading days			20
Debt instrument, threshold for trading days			30
Maximum days after five trading days			5 days
Applicable conversion price threshold (as percentage)			130.00%
Applicable conversion price, less than (as percentage)			97.00%
Debt instrument effective interest rate	4.80%
Non cash payment for derivative instrument		$ 59,500,000
Number of shares underlying warrant \| shares		4,400,000
Proceeds from issuances of warrants		$ 46,000,000
Warrant exercise price (usd per share) \| $ / shares		$ 71.775
Percentage above previous sales price		65.00%
Net cost of convertible note hedge and warrant			$ 13,500,000
Convertible Debt \| Convertible Notes, due 2024 \| Liability Component
Debt Instrument
Debt instrument face amount	$ 200,100,000
Debt issuance costs	5,300,000
Convertible Debt \| Convertible Notes, due 2024 \| Equity Component
Debt Instrument
Debt instrument face amount	58,700,000
Debt issuance costs	$ 1,500,000