Debt Covenant, Amount of Borrowing Available

No definition available.

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- Definition

Debt Instrument, Covenant Ratio, Debt To Capitalization Limit

+ References

No definition available.

+ Details

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- Definition

Additional borrowing capacity under the credit facility based on an accordion feature.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ 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))
-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 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Balance Type:	na
Period Type:	duration

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of cash paid for interest during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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- Details

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- Details

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DEBT (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
DEBT (Narrative) (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 26, 2013	Feb. 26, 2013	Dec. 08, 2011	Dec. 01, 2005
Debt Instrument [Line Items]
Interest payments made	$ 38.0	$ 33.0	$ 33.0
Interest rate description	Borrowings under the credit agreement will accrue interest based on (i) Libor or (ii) a base rate of the highest of (a) the federal funds rate plus 0.5%, (b) BofA’s announced prime rate, or (c) the Eurocurrency rate plus 1%, plus a margin. The interest rate and level of facility fees are dependent on certain financial ratios, as defined in the Credit Agreement. The Credit Agreement also provides customary fees, including administrative agent and commitment fees. In connection with the Credit Agreement, we paid customary transaction fees that have been deferred and are being amortized over the term of the Credit Agreement.
Debt to capitalization limit	60.00%
Description of debt to capitalization limit	0.6
2013 Senior Notes
Debt Instrument [Line Items]
Date of issuance	Feb. 26, 2013
Issued amount of debt					$ 500.0
3.70% Senior notes due 2023
Debt Instrument [Line Items]
Issued amount of debt					$ 225.0
Date of maturity	Feb. 26, 2023
Stated interest rate					3.70%
3.85% Senior notes due 2025
Debt Instrument [Line Items]
Issued amount of debt					$ 100.0
Date of maturity	Feb. 26, 2025
Stated interest rate					3.85%
4.05% Senior notes due 2028
Debt Instrument [Line Items]
Issued amount of debt					$ 75.0
Date of maturity	Feb. 26, 2028
Stated interest rate					4.05%
4.11% Senior notes due 2028
Debt Instrument [Line Items]
Date of issuance	Sep. 26, 2013
Issued amount of debt				$ 100.0
Date of maturity	Sep. 26, 2028
Stated interest rate				4.11%
2011 Notes
Debt Instrument [Line Items]
Date of issuance	Dec. 08, 2011
Issued amount of debt						$ 300.0
3.84% Senior notes due 2021
Debt Instrument [Line Items]
Issued amount of debt						$ 100.0
Date of maturity	Dec. 01, 2021
Stated interest rate						3.84%
4.24% Senior notes due 2026
Debt Instrument [Line Items]
Issued amount of debt						$ 200.0
Date of maturity	Dec. 01, 2026
Stated interest rate						4.24%
2005
Debt Instrument [Line Items]
Date of issuance	Dec. 01, 2005
Issued amount of debt							$ 150.0
Date of maturity	Dec. 01, 2017
Stated interest rate							5.51%
Revolving credit facility
Debt Instrument [Line Items]
Date of refinance	Aug. 31, 2012
Borrowing capacity	$ 500.0
Standby letters of credit
Debt Instrument [Line Items]
Letters of credit	47.2	$ 37.3
Revolving credit facility
Debt Instrument [Line Items]
Weighted-average interest rate		3.20%
Additional borrowing capacity allowed	100.0
Unused credit available under the credit facility	$ 453.0
Long-term debt
Debt Instrument [Line Items]
Weighted-average interest rate	3.90%	3.30%
Unused credit available under the credit facility	$ 800.0