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Inventories (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at March 31, 2018 and December 31, 2017 were as follows (in millions):
 
March 31, 2018
 
December 31, 2017
Finished goods
$
848.9

 
$
684.1

Repair and replacement parts
652.2

 
605.9

Work in process
277.9

 
178.7

Raw materials
504.3

 
404.2

Inventories, net
$
2,283.3

 
$
1,872.9