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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Reclassification out of Accumulated Other Comprehensive Income
The following table sets forth the significant amounts reclassified out of each component of accumulated other comprehensive loss and their effect on net income (loss) for the period (in millions):
 
2018
 
2017
 
2016
Amounts recognized as a component of net periodic pension and other postretirement benefit cost:
 
 
 
 
 
Amortization of net loss
$
(19.3
)
 
$
(29.8
)
 
$
(21.9
)
Amortization and curtailment recognition of prior service credit
26.4

 
18.4

 
10.7

Total before income taxes
7.1

 
(11.4
)
 
(11.2
)
Income tax (expense) benefit
(1.5
)
 
—

 
3.8

Total reclassifications for the period, net of income taxes
$
5.6

 
$
(11.4
)
 
$
(7.4
)