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Inventories (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following: 
 
 
March 31, 2018
 
December 31, 2017
 
 
(in millions)
 
 
 
 
 
Raw materials and work-in-progress
 
$
337.0

 
$
319.7

Finished goods
 
84.6

 
89.6

Gross inventories
 
421.6

 
409.3

Inventory valuation reserves
 
(18.3
)
 
(17.3
)
Inventories, net
 
$
403.3

 
$
392.0