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Acquisitions Acquisition (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 0 Months Ended 9 Months Ended
Jun. 27, 2014
Shotgun
May 29, 2014
Within Technologies
May 29, 2014
Within Technologies
Feb. 06, 2014
Delcam
Feb. 06, 2014
Delcam
Oct. 31, 2014
Other
business_combination
Business Acquisition [Line Items]            
Consideration $ 54.5 $ 88.0   $ 284.6   $ 207.2
Cash consideration 51.2          
Fair value of original convertible debt investment 3.3          
Goodwill, expected tax deductible amount     $ 78.9   $ 165.1  
Number of businesses acquired (businesses)           16