SAVINGS PLAN, PENSION AND POST-RETIREMENT BENEFITS - Fair Value of Asset Categories - 10K (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | $ 473.9 | $ 567.7 | |
Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 67.2 | 145.9 | |
Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 406.7 | 421.8 | |
Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | $ 1.9 |
Group Annuity Contract [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 2.8 | 2.8 | |
Group Annuity Contract [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Group Annuity Contract [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 2.8 | 2.8 | |
Group Annuity Contract [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. small/mid cap equity [Member] | Common and Preferred Stock [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 14.6 | 20.5 | |
U.S. small/mid cap equity [Member] | Common and Preferred Stock [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 14.6 | 20.5 | |
U.S. small/mid cap equity [Member] | Common and Preferred Stock [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. small/mid cap equity [Member] | Common and Preferred Stock [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. small/mid cap equity [Member] | Common and Collective Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 15.5 | 21 | |
U.S. small/mid cap equity [Member] | Common and Collective Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. small/mid cap equity [Member] | Common and Collective Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 15.5 | 21 | |
U.S. small/mid cap equity [Member] | Common and Collective Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate bonds [Member] | Mutual Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 14.9 | 17.5 | |
Corporate bonds [Member] | Mutual Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 14.9 | 17.5 | |
Corporate bonds [Member] | Mutual Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate bonds [Member] | Mutual Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate bonds [Member] | Fixed Income Securities [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 41.7 | 55 | |
Corporate bonds [Member] | Fixed Income Securities [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate bonds [Member] | Fixed Income Securities [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 41.7 | 55 | |
Corporate bonds [Member] | Fixed Income Securities [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate bonds [Member] | Common and Collective Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 61.5 | 75.4 | |
Corporate bonds [Member] | Common and Collective Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate bonds [Member] | Common and Collective Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 61.5 | 75.4 | |
Corporate bonds [Member] | Common and Collective Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate bonds [Member] | Hedge funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 3.8 | 6.8 | |
Corporate bonds [Member] | Hedge funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate bonds [Member] | Hedge funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 3.8 | 6.8 | |
Corporate bonds [Member] | Hedge funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Government bonds [Member] | Mutual Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 12.9 | 13.6 | |
Government bonds [Member] | Mutual Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 12.9 | 13.6 | |
Government bonds [Member] | Mutual Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Government bonds [Member] | Mutual Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Government bonds [Member] | Fixed Income Securities [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 6.9 | 10.9 | |
Government bonds [Member] | Fixed Income Securities [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Government bonds [Member] | Fixed Income Securities [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 6.9 | 10.9 | |
Government bonds [Member] | Fixed Income Securities [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Government bonds [Member] | Common and Collective Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 56.8 | 60 | |
Government bonds [Member] | Common and Collective Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Government bonds [Member] | Common and Collective Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 56.8 | 60 | |
Government bonds [Member] | Common and Collective Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Government bonds [Member] | Hedge funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 8.6 | (8.8) | |
Government bonds [Member] | Hedge funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Government bonds [Member] | Hedge funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 8.6 | (8.8) | |
Government bonds [Member] | Hedge funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. large cap equity [Member] | Mutual Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0.7 | 68.5 | |
U.S. large cap equity [Member] | Mutual Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0.7 | 68.5 | |
U.S. large cap equity [Member] | Mutual Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. large cap equity [Member] | Mutual Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. large cap equity [Member] | Common and Collective Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 71.9 | 24.3 | |
U.S. large cap equity [Member] | Common and Collective Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. large cap equity [Member] | Common and Collective Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 71.9 | 24.3 | |
U.S. large cap equity [Member] | Common and Collective Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. large cap equity [Member] | Hedge funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 3.8 | 9.1 | |
U.S. large cap equity [Member] | Hedge funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
U.S. large cap equity [Member] | Hedge funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 3.8 | 9.1 | |
U.S. large cap equity [Member] | Hedge funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
International equities [Member] | Mutual Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 3 | 7.3 | |
International equities [Member] | Mutual Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 3 | 7.3 | |
International equities [Member] | Mutual Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
International equities [Member] | Mutual Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
International equities [Member] | Common and Collective Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 77.8 | 89.9 | |
International equities [Member] | Common and Collective Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
International equities [Member] | Common and Collective Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 77.8 | 89.9 | |
International equities [Member] | Common and Collective Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
International equities [Member] | Hedge funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | | 15.9 | |
International equities [Member] | Hedge funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | | 0 | |
International equities [Member] | Hedge funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | | 15.9 | |
International equities [Member] | Hedge funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | | 0 | |
Emerging markets international equity [Member] | Mutual Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 5.1 | 6.1 | |
Emerging markets international equity [Member] | Mutual Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 5.1 | 6.1 | |
Emerging markets international equity [Member] | Mutual Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Emerging markets international equity [Member] | Mutual Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Emerging markets international equity [Member] | Common and Collective Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 14.5 | 17.6 | |
Emerging markets international equity [Member] | Common and Collective Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Emerging markets international equity [Member] | Common and Collective Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 14.5 | 17.6 | |
Emerging markets international equity [Member] | Common and Collective Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Emerging markets international equity [Member] | Hedge funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | | 4.1 | |
Emerging markets international equity [Member] | Hedge funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | | 0 | |
Emerging markets international equity [Member] | Hedge funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | | 4.1 | |
Emerging markets international equity [Member] | Hedge funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | | 0 | |
Other [Member] | Mutual Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 2 | 3.1 | |
Other [Member] | Mutual Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 2 | 3.1 | |
Other [Member] | Mutual Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other [Member] | Mutual Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other [Member] | Common and Collective Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 5.5 | 3.1 | |
Other [Member] | Common and Collective Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other [Member] | Common and Collective Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 5.5 | 3.1 | |
Other [Member] | Common and Collective Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other [Member] | Hedge funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 32.1 | 4.2 | |
Other [Member] | Hedge funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other [Member] | Hedge funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 32.1 | 4.2 | |
Other [Member] | Hedge funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Cash and cash equivalents [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 13.7 | 9.3 | |
Cash and cash equivalents [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 13.7 | 9.3 | |
Cash and cash equivalents [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Cash and cash equivalents [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Cash and cash equivalents [Member] | Common and Collective Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | (0.8) | 3.7 | |
Cash and cash equivalents [Member] | Common and Collective Funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0.3 | 0 | |
Cash and cash equivalents [Member] | Common and Collective Funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | (1.1) | 3.7 | |
Cash and cash equivalents [Member] | Common and Collective Funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Cash and cash equivalents [Member] | Hedge funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 4.6 | 26.8 | |
Cash and cash equivalents [Member] | Hedge funds [Member] | Level 1 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Cash and cash equivalents [Member] | Hedge funds [Member] | Level 2 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 4.6 | 26.8 | |
Cash and cash equivalents [Member] | Hedge funds [Member] | Level 3 [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | $ 0 | $ 0 | |