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Inventories (Details) - USD ($)
$ in Millions
Jan. 03, 2016
Dec. 28, 2014
Inventories    
Raw materials and supplies $ 141.6 $ 143.1
Work in process 149.4 153.5
Finished goods 45.8 43.3
Total inventories, Gross 336.8 339.9
Progress payments (12.3) (11.6)
Reduction to LIFO cost basis (15.3) (16.5)
Total inventories, net $ 309.2 $ 311.8