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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Components of Inventories The components of inventories as of December 31 follows:
(in millions)
 
2017
 
2016
Finished goods
 
$
291.9

 
$
218.6

Work-in-process
 
64.0

 
51.3

Raw materials
 
185.5

 
143.4

Reserves
 
(33.5
)
 
(36.3
)
Inventories
 
$
507.9

 
$
377.0