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ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassifications Out Of Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Amortization of pension and other postretirement plan items: |  |  |
Total net periodic benefit cost, net of tax |  | $ (2.2) | $ (2.5)
Amount reclassified from accumulated other comprehensive income |  |  |
Amortization of pension and other postretirement plan items: |  |  |
Prior service cost | [1] | 0.1 |
Recognized actuarial loss | [1] | (3.7) |
Total net periodic benefit cost, before tax |  | (3.6) |
Total net periodic benefit cost, tax benefit |  | 1.3 |
Total net periodic benefit cost, net of tax |  | $ (2.3) |
[1] | These accumulated other comprehensive income components are included in the computation of net periodic pension cost (See Note 9 Benefit Plans for additional details).

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- Definition Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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- Definition Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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