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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Details of Accumulated Other Comprehensive Income (Loss) Components (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (283.9) | $ (39.0) | $ (21.3) | $ (18.0)
Other Comprehensive Income (Loss), Foreign Currency Translation, Dissolution of Entity | 0.0 | 0.0 | 0.2 |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (1.7) | 0.0 | 1.2 |
Gain on foreign currency translation | (204.1) | 26.5 | 26.5 |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (40.8) | (44.2) | (29.8) |
Gain on foreign currency translation | (204.1) | 26.5 | 26.5 |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (0.6) | (0.5) | (3.3) |
Gain on foreign currency translation | (1.7) | 0.0 | 0.7 |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 2.7 | (13.9) | 18.4 |
Gain on foreign currency translation | (228.1) | 0.0 | 0.2 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (42.9) | (29.8) | (44.8) |
Gain on foreign currency translation | 25.7 | 26.5 | 25.6 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Amortization of prior service (cost) credit | 0.8 | 0.4 | 1.5 |
Defined Benefit Plan, Amortization of Gain (Loss) | 26.2 | 26.9 | 27.1 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0.3 | 0.0 | 0.0 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax | 25.7 | 26.5 | 25.6 |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | (0.1) |
Gain on foreign currency translation |  |  | 0.0 |
Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (228.1) | 0.0 | 0.2 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax | (228.1) | 0.0 | 0.0 |
Realized Gain Loss On Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
TaxOnDerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoEarnings | 0.0 | 0.0 | (0.5) |
Derivative, Gain (Loss) on Derivative, Net | (1.7) | 0.0 | 0.7 |
T-Lock Amortization [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0.0 | 0.0 | 1.2 |
Australian Hedge Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ (1.7) | $ 0.0 | $ 0.0 |

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