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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following: 
 
 
March 31, 2019
 
December 31, 2018
 
 
(in millions)
 
 
 
 
 
Raw materials and work-in-progress
 
$
381.0

 
$
375.1

Finished goods
 
89.0

 
99.0

Gross inventories
 
470.0

 
474.1

Inventory valuation reserves
 
(17.5
)
 
(14.4
)
Inventories, net
 
$
452.5

 
$
459.7