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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 14 Months Ended 37 Months Ended
Apr. 30, 2014
Dec. 31, 2014
Feb. 22, 2017
Dec. 31, 2015
Dec. 31, 2011
Oct. 21, 2015
Nov. 21, 2014
Dec. 31, 2016
Oct. 31, 2015
Oct. 14, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2016
Nov. 30, 2014
Oct. 26, 2015
Oct. 22, 2014
Jul. 24, 2013
Oct. 25, 2011
Stock Repurchases                                    
Total number of Shares Purchased       345,044       1,828,183         2,173,227          
Average Price Paid per Share (in dollars per share)       $ 53.46       $ 58.40                    
Aggregate Cost       $ 18.4       $ 106.8         $ 125.2          
Merger Agreement and Purchase Agreement                                    
Vesting period               3 years                    
CDMI                                    
Merger Agreement and Purchase Agreement                                    
Number of restricted stock purchased by certain principal owners of the acquiree 1,433,946                                  
Restricted common stock issued $ 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                                  
AFSC                                    
Merger Agreement and Purchase Agreement                                    
Number of restricted stock purchased by certain principal owners of the acquiree               60,069                    
Restricted common stock issued               $ 4.0                    
Trading day period to calculate average of the closing prices of the company's stock               5 years                    
Vesting period of restricted stock issued               2 years                    
Vesting percentage on the first anniversary of the acquisition               50.00%                    
Vesting percentage on the second anniversary of the acquisition               50.00%                    
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             3,385,326 3,153,156                
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      
October 2015 Share Repurchase Program | Subsequent event                                    
Stock Repurchases                                    
Total number of Shares Purchased     0