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Long-Term Debt And Notes Payable (Components Of Debt) (Detail) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 11, 2013
Debt Instrument [Line Items] |  |  |  |
Facility fee | 0.15% |  |  |
Debt Instrument, Basis Spread on Variable Rate | 5.00% |  |  |
Long-term Commercial Paper | $ 500,000,000 |  |  |
number of days to maturity | 397 |  |  |
Net decrease in short-term debt | $ 97,000,000 | $ 0 |  |
Long-term debt | 749,200,000 |  | $ 749,200,000 |
Line of Credit Facility, Amended Maximum Borrowing Capacity | 500,000,000 |  |  |
Short-term borrowings | $ 97,700,000 |  | $ 100,800,000 |
Margin | 0.10% |  |  |
Rate for LIBOR loans | 1.10% |  |  |
2.75% Notes Due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity Year Of Debt Instrument | 2018 | 2018 |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% |  | 2.75% | 2.75%
Long-term debt | $ 250,000,000 |  | $ 250,000,000 |
Other Liabilities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 700,000 |  | 800,000 |
Commercial Paper [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 97,000,000 |  | 0 |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 0 |  | 100,000,000 |
Six Point Five Five Percent Notes Due 2036 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 199,200,000 |  | 199,300,000 |
Four Point Four Five Percent Notes Due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.45%
Long-term debt | $ 300,000,000 |  | $ 300,000,000 |
4.45% Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity Year Of Debt Instrument | 2023 | 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.45% |  | 4.45% |
6.55% Notes Due 2036 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity Year Of Debt Instrument | 2036 | 2036 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.55% |  | 6.55% |

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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