EMPLOYEE BENEFIT PLANS - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 143.1	$ 146.2
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	6.1	3.8
Domestic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	28.1	16.7
Domestic exchange-traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	16.9	33.1
International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	24.5	18.6
International and emerging markets exchange-traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	4.1	7.2
U.S. Treasury obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	21.7	17.1
Domestic corporate bonds and notes
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	26.6	31.6
Foreign corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1.5	3.1
Limited partnership interest in private equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.1	0.2
Exchange-traded global real estate securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	9.9	11.2
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.1	0.2
Exchange-traded commodity fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	2.9	2.7
Other receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.6	0.7
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	114.8	111.1
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	6.1	3.8
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	28.1	16.7
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic exchange-traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	16.9	33.1
Quoted Prices in Active Markets for Identical Assets (Level 1) | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	24.5	18.6
Quoted Prices in Active Markets for Identical Assets (Level 1) | International and emerging markets exchange-traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	4.1	7.2
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	21.7	17.1
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic corporate bonds and notes
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Limited partnership interest in private equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange-traded global real estate securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	9.9	11.2
Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange-traded commodity fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	2.9	2.7
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.6	0.7
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	28.1	34.7
Significant Other Observable Inputs (Level 2) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Other Observable Inputs (Level 2) | Domestic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Other Observable Inputs (Level 2) | Domestic exchange-traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0
Significant Other Observable Inputs (Level 2) | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Other Observable Inputs (Level 2) | International and emerging markets exchange-traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0
Significant Other Observable Inputs (Level 2) | U.S. Treasury obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Other Observable Inputs (Level 2) | Domestic corporate bonds and notes
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	26.6	31.6
Significant Other Observable Inputs (Level 2) | Foreign corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1.5	3.1
Significant Other Observable Inputs (Level 2) | Limited partnership interest in private equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Other Observable Inputs (Level 2) | Exchange-traded global real estate securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year		0.0
Significant Other Observable Inputs (Level 2) | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Other Observable Inputs (Level 2) | Exchange-traded commodity fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Other Observable Inputs (Level 2) | Other receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Un-observable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.2	0.4
Significant Un-observable Inputs (Level 3) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Un-observable Inputs (Level 3) | Domestic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Un-observable Inputs (Level 3) | Domestic exchange-traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0
Significant Un-observable Inputs (Level 3) | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Un-observable Inputs (Level 3) | International and emerging markets exchange-traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0
Significant Un-observable Inputs (Level 3) | U.S. Treasury obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Un-observable Inputs (Level 3) | Domestic corporate bonds and notes
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Un-observable Inputs (Level 3) | Foreign corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Un-observable Inputs (Level 3) | Limited partnership interest in private equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.1	0.2
Significant Un-observable Inputs (Level 3) | Exchange-traded global real estate securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year		0.0
Significant Un-observable Inputs (Level 3) | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.1	0.2
Significant Un-observable Inputs (Level 3) | Exchange-traded commodity fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0.0	0.0
Significant Un-observable Inputs (Level 3) | Other receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 0.0	$ 0.0