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Inventories (Tables)
 12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at December 31, 2019 and 2018 were as follows (in millions):
 
 
2019
 
2018
Raw materials and supplies
 
$
164.9

 
$
191.5

Work-in-process
 
899.6

 
914.1

Finished goods
 
161.3

 
191.1

Total inventories at current cost
 
1,225.8

 
1,296.7

Adjustment from current cost to LIFO cost basis
 
33.6

 
2.9

Inventory valuation reserves
 
(104.1
)
 
(88.5
)
Total inventories, net
 
$
1,155.3

 
$
1,211.1
Schedule of Inventory Valuation Impact on Income
 
 
Fiscal year ended December 31,
 
 
2019
2018
2017
LIFO benefit (charge)
 
$
25.5

$
(28.6
)
$
(54.2
)
NRV benefit (charge)
 
(25.6
)
27.9

54.0

Net cost of sales impact
 
$
(0.1
)
$
(0.7
)
$
(0.2
)