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Property, Plant and Equipment, net (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Components of property, plant, and equipment, net The components of property, plant and equipment, net of accumulated depreciation as of December 31 follows:
(in millions)
 
2017
 
2016
Land
 
$
74.5

 
$
60.2

Buildings and leasehold improvements
 
389.1

 
342.5

Machinery and equipment
 
896.9

 
784.7

Projects in progress
 
127.2

 
57.5

Property, plant and equipment, gross
 
1,487.7

 
1,244.9

Accumulated depreciation
 
(706.8
)
 
(612.7
)
Property, plant and equipment, net
 
$
780.9

 
$
632.2