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Inventories (Details) - USD ($)
$ in Millions
Apr. 02, 2017
Jan. 01, 2017
Inventories    
Raw materials and supplies $ 179.5 $ 146.0
Work in process 196.8 147.8
Finished goods 58.9 43.0
Total inventories, gross 435.2 336.8
Progress payments (6.3) (9.1)
Reduction to LIFO cost basis (13.3) (13.5)
Total inventories, net $ 415.6 $ 314.2