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Long-Term Debt, U.S. Senior Notes (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Sep. 14, 2021
Apr. 01, 2020
Feb. 20, 2020
Sep. 11, 2019
Sep. 10, 2019
Jan. 09, 2019
Jan. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 01, 2021
Aug. 16, 2021
Sep. 04, 2019
Debt                          
Repayments of long-term debt               $ 912.6 $ 404.4 $ 1,111.5      
Premiums paid on early extinguishment of debt               0.0 0.0 13.4      
Gain (loss) on extinguishment of debt               $ 0.0 $ 0.0 (14.3)      
Gain (loss) on extinguishment of debt, after tax                   $ (12.5)      
Gain (loss) on extinguishment of debt, per diluted share                   $ (0.02)      
Tender Offers [Member]                          
Debt                          
Total consideration for debt tender offers       $ 368.8                  
Premiums paid on early extinguishment of debt       13.4                  
U.S. Senior Notes                          
Debt                          
Redemption price as a percentage of principal amount               100.00%          
2.20% Senior Notes due April 2020                          
Debt                          
Stated interest rate (as a percent)   2.20%                      
Repayments of long-term debt   $ 400.0                      
2.55% Senior Notes                          
Debt                          
Stated interest rate (as a percent)             2.55%            
Repayments of long-term debt             $ 750.0            
4.350% Senior Notes due June 2029                          
Debt                          
Redemption price as a percentage of principal amount           100.00%              
Debt instrument, principal amount           $ 500.0              
Stated interest rate (as a percent)           4.35%   4.35% 4.35%        
Debt instrument, face amount, net of discount (as a percent)           99.904%              
Debt maturity date               Jun. 01, 2029          
2.800% Senior Notes due February 2030                          
Debt                          
Redemption price as a percentage of principal amount         100.00%                
Debt instrument, principal amount         $ 900.0                
Stated interest rate (as a percent)         2.80%     2.80% 2.80%        
Debt instrument, face amount, net of discount (as a percent)         99.92%                
Debt maturity date               Feb. 15, 2030          
3.125% Senior Notes Due September 2021 and 4.00% Senior Notes due February 2022 [Member] | Tender Offers [Member]                          
Debt                          
Accrued interest       $ 3.1                  
3.125% Senior Notes due September 2021                          
Debt                          
Debt instrument, principal amount                       $ 227.7  
Stated interest rate (as a percent)                 3.125%     3.125%  
3.125% Senior Notes due September 2021 | Tender Offers [Member]                          
Debt                          
Redemption price as a percentage of principal amount       101.90%                  
Debt instrument, principal amount                         $ 375.0
Senior Note principal redeemed       $ 147.3                  
4.00% Senior Notes due February 2022                          
Debt                          
Debt instrument, principal amount                     $ 295.0    
Stated interest rate (as a percent)                 4.00%   4.00%    
4.00% Senior Notes due February 2022 | Tender Offers [Member]                          
Debt                          
Redemption price as a percentage of principal amount       104.50%                  
Debt instrument, principal amount                         $ 500.0
Senior Note principal redeemed       $ 205.0                  
3.20% Senior Notes due April 2024                          
Debt                          
Stated interest rate (as a percent)               3.20% 3.20%        
2.05% Senior Notes due March 2025                          
Debt                          
Redemption price as a percentage of principal amount     100.00%                    
Debt instrument, principal amount     $ 400.0                    
Stated interest rate (as a percent)     2.05%         2.05% 2.05%        
Debt instrument, face amount, net of discount (as a percent)     99.829%                    
Debt maturity date               Mar. 01, 2025          
2.200% Senior Notes due September 2031                          
Debt                          
Redemption price as a percentage of principal amount 100.00%                        
Debt instrument, principal amount $ 750.0                        
Stated interest rate (as a percent) 2.20%             2.20%          
Debt instrument, face amount, net of discount (as a percent) 99.634%                        
Debt maturity date               Sep. 15, 2031