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Long-Term Debt, U.S. Senior Notes (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 11, 2019
Sep. 10, 2019
Jan. 09, 2019
Apr. 05, 2017
Jan. 31, 2019
Sep. 30, 2017
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 04, 2019
Debt                      
Repayments of long-term debt               $ 1,111.5 $ 15.2 $ 375.0  
Premiums paid on early extinguishment of debt               13.4 0.0 0.0  
Gain (loss) on extinguishment of debt             $ (14.3) (14.3) $ 0.0 $ 0.0  
Gain (loss) on extinguishment of debt, after tax             $ (12.5) $ (12.5)      
Gain (loss) on extinguishment of debt, per diluted share             $ (0.04) $ (0.04)      
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                      
Debt instrument, principal amount       $ 400.0              
Stated interest rate (as a percent)       2.20%       2.20% 2.20%    
Debt instrument, face amount, net of discount (as a percent)       99.922%              
1.55% Senior Notes due September 2017                      
Debt                      
Stated interest rate (as a percent)           1.55%          
Repayments of long-term debt           $ 375.0          
2.55% Senior Notes due January 2019                      
Debt                      
Stated interest rate (as a percent)         2.55%       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%                
Debt instrument, face amount, net of discount (as a percent)     99.904%                
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%      
Debt instrument, face amount, net of discount (as a percent)   99.92%                  
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                      
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
Stated interest rate (as a percent)                     3.125%
Senior Note principal redeemed $ 147.3                    
4.00% Senior Notes due February 2022                      
Debt                      
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
Stated interest rate (as a percent)                     4.00%
Senior Note principal redeemed $ 205.0                    
3.20% Senior Notes due April 2024                      
Debt                      
Redemption price as a percentage of principal amount       100.00%              
Debt instrument, principal amount       $ 350.0              
Stated interest rate (as a percent)       3.20%       3.20% 3.20%    
Debt instrument, face amount, net of discount (as a percent)       99.888%