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Acquisitions - Other Acquisitions (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2015
Jul. 01, 2014
Apr. 30, 2014
Oct. 01, 2013
Dec. 31, 2015
Dec. 31, 2013
Alpha Care Holdings Inc.            
Acquisitions            
Percentage of equity interest acquired           65.00%
Amount of additional Preferred Shares purchased         $ 23.6  
Percentage of ownership held         82.00%  
Voting interest of remaining shareholders         18.00%  
CDMI            
Acquisitions            
Amount of consideration paid in cash     $ 201.0      
Reduction to consideration paid due to net receipts received for working capital adjustments     4.0      
Acquisition disclosures            
Maximum potential contingent payments     $ 165.0      
HSM            
Acquisitions            
Amount of consideration paid in cash $ 13.6          
Reduction to consideration paid due to net receipts received for working capital adjustments $ 0.1          
Partners Rx            
Acquisitions            
Amount of consideration paid in cash       $ 99.3    
Reduction to consideration paid due to net receipts received for working capital adjustments       $ 0.7    
Cobalt            
Acquisitions            
Amount of consideration paid in cash   $ 7.8        
Reduction to consideration paid due to net receipts received for working capital adjustments   0.2        
Acquisition disclosures            
Maximum potential contingent payments   $ 6.0