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Acquisitions (Details 2) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Jan. 31, 2015
Apr. 30, 2014
Sep. 30, 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 $ 13.5