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DEBT (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 26, 2013 | Feb. 26, 2013 | Dec. 08, 2011 | Dec. 01, 2005
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest payments made | $ 39.0 | $ 38.0 | $ 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, the Corporation 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% |  |  |  |  |  |
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
5.51% Senior notes due 2017 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
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 | 21.3 | $ 47.2 |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Additional borrowing capacity allowed | 100.0 |  |  |  |  |  |
Unused credit available under the credit facility | $ 479.0 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted-average interest rate | 3.90% | 3.90% |  |  |  |  |
Unused credit available under the credit facility | $ 1,400.0 |  |  |  |  |  |

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