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Long-Term Debt Interest Rates (Details)
€ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Feb. 01, 2015
USD ($)
Feb. 28, 2015
USD ($)
Jan. 31, 2015
USD ($)
Feb. 28, 2017
USD ($)
Feb. 28, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 18, 2014
Dec. 08, 2014
Nov. 24, 2014
Dec. 10, 2010
Jan. 20, 2005
Debt Instrument [Line Items]                          
Repayments of long-term debt           $ 1,252,302,000 $ 2,626,241,000 $ 6,017,000          
364 Day Facility                          
Debt Instrument [Line Items]                          
Repayments of long-term debt           300,000,000              
Five Year Facility                          
Debt Instrument [Line Items]                          
Repayments of long-term debt           950,000,000              
1.875% Senior Notes                          
Debt Instrument [Line Items]                          
Unamortized discount and debt issuance costs           $ 7,823,000 $ 9,904,000            
Debt instrument, interest rate           1.875% 1.875%   1.875% 1.875%      
3.00% Senior Notes                          
Debt Instrument [Line Items]                          
Unamortized discount and debt issuance costs           $ 1,286,000 $ 1,726,000            
Debt instrument, interest rate           3.00% 3.00%       3.00%    
4.15% Senior Notes                          
Debt Instrument [Line Items]                          
Unamortized discount and debt issuance costs           $ 3,859,000 $ 4,346,000            
Debt instrument, interest rate           4.15% 4.15%       4.15%    
4.50% Senior Notes                          
Debt Instrument [Line Items]                          
Unamortized discount and debt issuance costs           $ 2,380,000 $ 2,982,000            
Debt instrument, interest rate           4.50% 4.50%         4.50%  
5.10% Senior Notes                          
Debt Instrument [Line Items]                          
Debt instrument, interest rate                         5.10%
Repayments of long-term debt $ 325,000,000                        
5.45% Senior Notes                          
Debt Instrument [Line Items]                          
Unamortized discount and debt issuance costs           $ 4,313,000 $ 4,468,000            
Debt instrument, interest rate           5.45% 5.45%       5.45%    
Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Repayments of long-term debt   $ 250,000,000                      
Short-term Debt | Term Loan                          
Debt Instrument [Line Items]                          
Repayments of long-term debt   $ 183,500,000 $ 816,500,000                    
Senior Unsecured Cash Bridge Facility | Bridge Loan                          
Debt Instrument [Line Items]                          
Repayments of long-term debt     $ 800,000,000                    
Domestic Financial Institution Agreement                          
Debt Instrument [Line Items]                          
Long-term line of credit           $ 0 $ 0            
Foreign Credit Line U S Dollar Euro Denominated Borrowings                          
Debt Instrument [Line Items]                          
Long-term line of credit           0 0            
Other Foreign Credit Lines                          
Debt Instrument [Line Items]                          
Long-term line of credit           $ 0 $ 0            
Subsequent Event | Senior Notes | 1.875% Senior Notes                          
Debt Instrument [Line Items]                          
Repayments of long-term debt | €         € 307.0                
Subsequent Event | Senior Notes | 3.00% Senior Notes                          
Debt Instrument [Line Items]                          
Repayments of long-term debt       $ 250,000,000                  
Subsequent Event | Senior Notes | 4.50% Senior Notes                          
Debt Instrument [Line Items]                          
Repayments of long-term debt       $ 174,700,000