Line of Credit Facility, Amended Maximum Borrowing Capacity

No definition available.

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- Definition

Notes Issued, Term

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- Definition

number of days to maturity from date of issue

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No definition available.

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- Definition

Percentage of original payment amount if the notes are required to be repurchased.

+ References

No definition available.

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- Definition

Uncommitted letter of credit reimbursement agreement.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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- Definition

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

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- Definition

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

+ References

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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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- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Line-of-Credit Arrangement
-URI http://asc.fasb.org/extlink&oid=6517033

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer).

+ 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 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The fair value of notes issued in noncash investing and financing activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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- Definition

Indebtedness divided by net capital.

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No definition available.

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Long-Term Debt And Notes Payable (Narrative) (Details) - USD ($)	1 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2013	Nov. 30, 2006	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2013	May 31, 2012	Sep. 30, 2003
Debt Instrument [Line Items]
Line of credit facility, amended maximum borrowing capacity						$ 500,000,000	$ 300,000,000
Long-term debt				$ 745,300,000	$ 744,600,000
Total debt to capitalization ratio				0.40
Standby letters of credit				$ 24,000,000
Uncommitted letter of credit reimbursement agreement				48,000,000
Long-term Commercial Paper			$ 500,000,000
number of days to maturity			397
4.45% Notes Due 2023 [Member]
Debt Instrument [Line Items]
Notes issued, term	10 years
Notes issued	$ 300,000,000
Debt instrument interest rate					4.45%
Long-term debt				$ 298,100,000	$ 297,900,000
Percentage of principal amount Company may be required to buy back at	101.00%
Annualized interest rate including debt issuance cost amortization				4.56%
2.75% Notes Due 2018 [Member]
Debt Instrument [Line Items]
Notes issued	$ 250,000,000
Debt instrument interest rate					2.75%
Long-term debt				$ 249,200,000	$ 248,800,000
Percentage of principal amount Company may be required to buy back at	101.00%
Annualized interest rate including debt issuance cost amortization				2.92%
5.50% Notes Due 2013 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate								5.50%
6.55% Notes Due 2036 [Member]
Debt Instrument [Line Items]
Notes issued, term		30 years
Notes issued		$ 200,000,000
Debt instrument interest rate		6.55%
Long-term debt				$ 198,000,000	197,900,000
Percentage of principal amount Company may be required to buy back at		101.00%
Annualized interest rate including debt issuance cost amortization				6.67%
Commercial Paper [Member]
Debt Instrument [Line Items]
Long-term debt				$ 0	$ 49,000,000
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				1.05%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				1.475%
Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				0.50%
Adjusted London Interbank Offered Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				1.00%
Adjusted London Interbank Offered Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				0.05%
Adjusted London Interbank Offered Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				0.475%