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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consist of the following:
 June 30, 2021December 31, 2020
 (in millions)
   
Raw materials and work-in-progress$334.3 $276.2 
Finished goods83.8 70.4 
Gross inventories418.1 346.6 
Inventory valuation reserves(23.1)(23.4)
Inventories, net$395.0 $323.2