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Inventories (Tables)
 3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories at March 31, 2019 and December 31, 2018 were as follows (in millions):
 
March 31,
2019
 
December 31,
2018
Raw materials and supplies
$
212.5

 
$
191.5

Work-in-process
941.3

 
914.1

Finished goods
192.4

 
191.1

Total inventories at current cost
1,346.2

 
1,296.7

Adjustment from current cost to LIFO cost basis
4.7

 
2.9

Inventory valuation reserves
(96.5
)
 
(88.5
)
Total inventories, net
$
1,254.4

 
$
1,211.1
Schedule of Inventory Valuation Impact on Income
Impacts to cost of sales for changes in the LIFO costing methodology and associated NRV inventory reserves were as follows (in millions):
 
 
Three months ended March 31,
 
 
2019
 
2018
LIFO benefit (charge)
 
$
1.8

 
$
(8.2
)
NRV benefit (charge)
 
(1.9
)
 
8.2

Net cost of sales impact
 
$
(0.1
)
 
$
—