Property, Plant and Equipment (Tables)
 9 Months Ended
Feb. 28, 2014
Property, Plant and Equipment [Abstract]  
Useful Lives of Property, Plant and Equipment
Useful lives by major product category consisted of the following:
 
 
Useful life
Land improvements
20 years
Buildings and leasehold improvements
30 years
Machinery and equipment
5-10 years
Instruments
4 years
Components of Property, Plant and Equipment
Property, plant and equipment consisted of the following:
 
(in millions)
February 28, 2014
 
May 31, 2013
Land and land improvements
$
40.7

 
$
40.5

Buildings and leasehold improvements
115.5

 
106.3

Machinery and equipment
400.1

 
375.4

Instruments
801.3

 
710.5

Construction in progress
61.3

 
48.8

Total property, plant and equipment
1,418.9

 
1,281.5

Accumulated depreciation
(728.0
)
 
(616.3
)
Total property, plant and equipment, net
$
690.9

 
$
665.2