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BENEFIT PLANS (Benefit Costs Included in Accumulated Other Comprehensive Loss that have not yet Recognized in Net Periodic Pension Cost) (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss | $ 245.8 | $ 263.3 | $ 202.2
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost, net of accumulated taxes of $3.6 and $4.0 in 2015 and 2014, respectively, for pension benefits and $(1.6) and $(2.1) in 2015 and 2014, respectively, for other benefits | 6.1 | 6.6 |
Net actuarial loss, net of accumulated taxes of $132.6 and $145.5 in 2015 and 2014, respectively, for pension benefits and $3.6 and $2.7 in 2015 and 2014, respectively, for other benefits | 236.4 | 255.7 |
Accumulated other comprehensive loss | 242.5 | 262.3 |
Prior service cost, accumulated taxes | 4.0 | 4.0 |
Net Actuarial Loss, Accumulated Taxes | 132.6 | 146.0 |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost, net of accumulated taxes of $3.6 and $4.0 in 2015 and 2014, respectively, for pension benefits and $(1.6) and $(2.1) in 2015 and 2014, respectively, for other benefits | (2.8) | (3.5) |
Net actuarial loss, net of accumulated taxes of $132.6 and $145.5 in 2015 and 2014, respectively, for pension benefits and $3.6 and $2.7 in 2015 and 2014, respectively, for other benefits | 6.1 | 4.5 |
Accumulated other comprehensive loss | 3.3 | 1.0 |
Prior service cost, accumulated taxes | (1.6) | (2.1) |
Net Actuarial Loss, Accumulated Taxes | $ 3.6 | $ 2.7 |

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- Definition The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + 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 (j-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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