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Shareholders' Equity
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Shareholders' Equity
Shareholders' Equity
Reclassifications from 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 September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
Amounts recognized as a component of net periodic pension and other postretirement benefit cost:
 
 
 
 
 
 
 
Amortization of net loss
$
(2.6
)
 
$
(6.1
)
 
$
(16.7
)
 
$
(17.9
)
Amortization of prior service credit
3.4

 
4.6

 
11.6

 
13.7

Total before income taxes
0.8

 
(1.5
)
 
(5.1
)
 
(4.2
)
Income tax (expense) benefit
(0.1
)
 
0.5

 
1.1

 
1.5

Total reclassifications for the period, net of income taxes
$
0.7

 
$
(1.0
)
 
$
(4.0
)
 
$
(2.7
)

The Company records unrealized gains and losses related to net periodic pension and other postretirement benefit cost net of estimated taxes in Accumulated other comprehensive income (loss). The Company has a valuation allowance against its net U.S. deferred tax asset that is not expected to be realized. A portion of this valuation allowance is related to deferred tax benefits or expense as recorded in Accumulated other comprehensive income (loss).