| ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassifications Out Of Accumulated Other Comprehensive Income) (Details) $ in Millions | 12 Months Ended | 
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| Dec. 31, 2017  USD ($) | |
| Prior service cost | |
| Amortization of pension and other postretirement plan items: | |
| Total net periodic benefit cost, before tax | $ 0.4 | 
| Recognized actuarial loss | |
| Amortization of pension and other postretirement plan items: | |
| Total net periodic benefit cost, before tax | (16.8) | 
| Accumulated Defined Benefit Plans Adjustment Attributable to Parent | |
| Amortization of pension and other postretirement plan items: | |
| Total net periodic benefit cost, before tax | (16.4) | 
| Total net periodic benefit cost, tax benefit | 4.0 | 
| Total net periodic benefit cost, net of tax | $ (12.4) | 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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