Inventories (Tables)

12 Months Ended

Dec. 31, 2015

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories at December 31, 2015 and 2014 were as follows (in millions):

	2015			2014
Raw materials and supplies	$	216.0		$	249.3
Work-in-process	990.3			1,184.1
Finished goods	184.1			172.2
Total inventories at current cost	1,390.4			1,605.6
Adjustment from current cost to LIFO cost basis	136.4			4.8
Inventory valuation reserves	(206.3		)	(68.8		)
Progress payments	(48.9		)	(68.8		)
Total inventories, net	$	1,271.6		$	1,472.8

Schedule of Inventory Valuation Impact on Income

Impacts to cost of sales for changes in the LIFO costing methodology and associated NRV reserves were as follows (in millions):

	Fiscal year ended December 31,
	2015			2014			2013
LIFO benefit (charge)	$	131.6		$	(24.7	)	$	80.9
NRV benefit (charge)	$	(131.5	)	$	25.0		$	(35.0	)
Net cost of sales impact	$	0.1		$	0.3		$	45.9