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Long-Term Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 15, 2015
Sep. 14, 2015
Feb. 01, 2015
Feb. 07, 2014
Jan. 31, 2015
Dec. 31, 2015
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Jan. 12, 2015
Dec. 31, 2014
Jan. 20, 2005
Debt Instrument [Line Items]                            
Proceeds from borrowings of long-term debt                   $ 1,000,000,000 $ 0      
Repayments of long-term debt                   1,332,293,000 3,023,000      
Net investment hedge, gain (loss)             $ (3,407,000)   $ 0 39,709,000 0      
Debt financing costs                   4,186,000 $ 3,074,000      
Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Proceeds from borrowings of long-term debt         $ 250,000,000                  
Repayments of long-term debt               $ 250,000,000            
Bridge Loan                            
Debt Instrument [Line Items]                            
Debt related commitment fees and debt issuance costs                   $ 2,300,000        
4.625% Senior Notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount                       $ 1,250,000,000    
Debt instrument, interest rate             4.625%     4.625%   4.625%    
Unamortized premium             $ 38,303,000     $ 38,303,000   $ 43,700,000    
Debt instrument, interest rate, effective percentage                       3.95%    
5.10% Senior Notes                            
Debt Instrument [Line Items]                            
Debt instrument, interest rate                         5.10% 5.10%
Repayments of long-term debt     $ 325,000,000                      
Commercial Paper                            
Debt Instrument [Line Items]                            
Weighted average interest rate             0.84%     0.84%        
Weighted average maturity period                   21 days        
1.875% Senior Notes                            
Debt Instrument [Line Items]                            
Debt instrument, interest rate             1.875%     1.875%     1.875%  
Short-term Debt | August 2014 Term Loan Agreement                            
Debt Instrument [Line Items]                            
Proceeds from borrowings of long-term debt         1,000,000,000                  
Repayments of long-term debt               1,000,000,000            
Senior Unsecured Cash Bridge Facility | Bridge Loan                            
Debt Instrument [Line Items]                            
Proceeds from borrowings of long-term debt         $ 800,000,000                  
Repayments of long-term debt               $ 800,000,000            
Subsequent Event | 4.625% Senior Notes                            
Debt Instrument [Line Items]                            
Debt instrument, redemption price, percentage 103.469%                          
Payments of debt premium $ 43,300,000                          
Loss on early extinguishment of debt           $ 5,400,000                
Subsequent Event | 364 Day Facility                            
Debt Instrument [Line Items]                            
Debt instrument, face amount 300,000,000                          
Subsequent Event | Five Year Facility                            
Debt Instrument [Line Items]                            
Debt instrument, face amount $ 950,000,000                          
Long-term debt principal payment amount prior to second anniversary of funding, percentage 1.25%                          
Long-term debt principal payment amount on or after second anniversary of funding, percentage 2.50%                          
London Interbank Offered Rate (LIBOR) | Subsequent Event | September 2015 Term Loan Agreement                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate 1.375%                          
London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate   1.00%   0.90%                    
London Interbank Offered Rate (LIBOR) | Minimum | Subsequent Event | September 2015 Term Loan Agreement                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate 1.00%                          
London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate   1.70%   1.50%                    
London Interbank Offered Rate (LIBOR) | Maximum | Subsequent Event | September 2015 Term Loan Agreement                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate 1.875%                          
Federal funds rate | Subsequent Event | September 2015 Term Loan Agreement                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate 0.50%                          
One-Month London Interbank Offered Rate (LIBOR) | Subsequent Event | September 2015 Term Loan Agreement                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate 1.00%                          
Base Rate Additional Margin | Minimum | Subsequent Event | September 2015 Term Loan Agreement                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate 0.00%                          
Base Rate Additional Margin | Maximum | Subsequent Event | September 2015 Term Loan Agreement                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate 0.875%