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Shareholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of Amounts Reclassified out of Each Component of Accumulated Other Comprehensive Loss
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):
 
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Amounts recognized as a component of net periodic pension and other postretirement benefit cost:
 
 
 
 
 
 
 
Amortization of net loss
$
(6.1
)
 
$
(5.9
)
 
$
(14.1
)
 
$
(11.8
)
Amortization of prior service credit
3.7

 
4.6

 
8.2

 
9.1

Total before income taxes
(2.4
)
 
(1.3
)
 
(5.9
)
 
(2.7
)
Income tax benefit
0.5

 
0.5

 
1.2

 
1.0

Total reclassifications for the period, net of income taxes
$
(1.9
)
 
$
(0.8
)
 
$
(4.7
)
 
$
(1.7
)