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Inventories (Tables)
 3 Months Ended
Apr. 01, 2018
Inventory Disclosure [Abstract]  
Inventories
 
Balance at
Inventories (in millions):
April 1, 2018
 
December 31, 2017
Raw materials and supplies
$
202.3

 
$
200.2

Work in process
138.9

 
157.9

Finished goods
50.0

 
54.1

 
391.2

 
412.2

Progress payments
—

 
(1.4
)
Reduction to LIFO cost basis
(9.4
)
 
(10.6
)
Total inventories, net
$
381.8

 
$
400.2