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Stockholders' Equity - Stock Repurchases, Merger Agreement (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 10 Months Ended 11 Months Ended 12 Months Ended 36 Months Ended
Apr. 30, 2014
Oct. 01, 2013
Dec. 31, 2014
Feb. 24, 2016
Dec. 31, 2015
Dec. 31, 2011
Oct. 21, 2015
Oct. 21, 2015
Nov. 21, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 21, 2014
Oct. 26, 2015
Oct. 22, 2014
Jul. 24, 2013
Oct. 25, 2011
Merger Agreement and Purchase Agreement                                    
Vesting period                   3 years                
Partners Rx                                    
Merger Agreement and Purchase Agreement                                    
Number of restricted stock purchased by certain principal owners of the acquiree   175,596                   175,596            
Purchase price of restricted stock   $ 10.0                                
Trading day period to calculate average of the closing prices of the company's stock   5 days                                
Vesting period of restricted stock issued   3 years                                
Vesting percentage on the second anniversary of the acquisition   50.00%                                
Vesting percentage on the third anniversary of the acquisition   50.00%                                
CDMI                                    
Merger Agreement and Purchase Agreement                                    
Number of restricted stock purchased by certain principal owners of the acquiree 1,433,946                   1,433,946              
Purchase price of restricted stock $ 80.0                                  
Trading day period to calculate average of the closing prices of the company's stock 5 days                                  
Vesting period of restricted stock issued 42 months                                  
CDMI | 25% vesting                                    
Merger Agreement and Purchase Agreement                                    
Vested and expected to vest for the period (as a percent) 25.00%                                  
Vesting period 18 months                                  
CDMI | 75% vesting                                    
Merger Agreement and Purchase Agreement                                    
Vested and expected to vest for the period (as a percent) 75.00%                                  
Vesting period 42 months                                  
October 2011 Share Repurchase Program                                    
Stock Repurchases                                    
Amount authorized under stock repurchase plan                                 $ 300.0 $ 200.0
Total number of Shares Purchased           671,776     3,183,306     1,159,871 459,252 5,474,205        
Average Price Paid per Share (in dollars per share)           $ 48.72     $ 57.82     $ 51.83 $ 50.27          
Aggregate Cost           $ 32.7     $ 184.1     $ 60.1 $ 23.1 $ 300.0        
October 2014 Share Repurchase Program                                    
Stock Repurchases                                    
Amount authorized under stock repurchase plan                               $ 200.0    
Total number of Shares Purchased     232,170       3,153,156 3,385,326                    
Average Price Paid per Share (in dollars per share)     $ 60.65       $ 58.96                      
Aggregate Cost     $ 14.1       $ 185.9 $ 200.0                    
October 2015 Share Repurchase Program                                    
Stock Repurchases                                    
Amount authorized under stock repurchase plan                             $ 200.0      
Total number of Shares Purchased       0 345,044                          
Average Price Paid per Share (in dollars per share)         $ 53.46                          
Aggregate Cost         $ 18.4