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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Components of Inventories The components of inventory are summarized as follows:
(in millions)
 
September 30, 2017
 
December 31, 2016
Finished goods
 
$
256.3

 
$
218.6

Work-in-process
 
69.6

 
51.3

Raw materials
 
163.8

 
143.4

Reserves
 
(34.9
)
 
(36.3
)
Inventories
 
$
454.8

 
$
377.0