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RECENT ACCOUNTING PRONOUNCEMENTS Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Excess tax benefit recorded to equity section of balance sheet | $ 0.0 | $ 3.0
Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Excess tax benefit recorded to tax expense | 1.1 |
Excess tax benefit recorded to equity section of balance sheet | (3.0) |
Previously Unrecognized Tax Benefits Due to NOL Carryforwards [Member] | Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax | (2.1) |
Forfeiture Rate Estimate Adjustment [Member] | Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax | (1.6) |
Deferred Tax Assets [Member] | Previously Unrecognized Tax Benefits Due to NOL Carryforwards [Member] | Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax | (25.6) |
Valuation Allowance, Operating Loss Carryforwards [Member] | Previously Unrecognized Tax Benefits Due to NOL Carryforwards [Member] | Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ (23.5) |

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