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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at December 31, 2018 and 2017 were as follows (in millions):
 
 
2018
 
2017
Raw materials and supplies
 
$
191.5

 
$
162.8

Work-in-process
 
914.1

 
955.5

Finished goods
 
191.1

 
165.0

Total inventories at current cost
 
1,296.7

 
1,283.3

Adjustment from current cost to LIFO cost basis
 
2.9

 
43.1

Inventory valuation reserves
 
(88.5
)
 
(121.5
)
Progress payments
 
—

 
(28.8
)
Total inventories, net
 
$
1,211.1

 
$
1,176.1
Schedule of Inventory Valuation Impact on Income
 
 
Fiscal year ended December 31,
 
 
2018
2017
2016
LIFO benefit (charge)
 
$
(28.6
)
$
(54.2
)
$
(39.1
)
NRV benefit (charge)
 
27.9

54.0

39.9

Net cost of sales impact
 
$
(0.7
)
$
(0.2
)
$
0.8