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Debt (Senior Notes) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 11, 2021
Jan. 29, 2021
May 26, 2020
Feb. 20, 2020
Feb. 04, 2020
Aug. 15, 2016
Jul. 01, 2014
Dec. 31, 2020
Oct. 13, 2017
2014 Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Repayments of unsecured debt       $ 750.0 $ 750.0        
Premium on redemption       9.1          
Write-off of deferred financing fees       $ 7.7          
Unsecured senior notes             $ 750.0    
Debt instrument, maturity date               Jul. 15, 2022  
Debt instrument, interest rate, stated percentage             4.875% 4.875%  
Percentage of face value price for issuance of senior notes             99.178%    
Interest payable dates               January 15 and July 15  
Financing fees             $ 11.6    
2016 Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Unsecured senior notes           $ 1,100.0      
Debt instrument, maturity date               Sep. 01, 2024  
Debt instrument, interest rate, stated percentage           4.875%   4.875%  
Percentage of face value price for issuance of senior notes           99.178%      
Interest payable dates               March 1 and September 1  
Financing fees           $ 12.8      
2016 Senior Notes [Member] | Redemption, Period One [Member]                  
Debt Instrument [Line Items]                  
Redemption period               Sep. 01, 2020  
Redemption price, percentage               102.438%  
2016 Senior Notes [Member] | Redemption, Period Two [Member]                  
Debt Instrument [Line Items]                  
Redemption period               Sep. 01, 2021  
Redemption price, percentage               101.219%  
2016 Senior Notes [Member] | Redemption, Period Three [Member]                  
Debt Instrument [Line Items]                  
Redemption period               Sep. 01, 2022  
Redemption price, percentage               100.00%  
2017 Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Unsecured senior notes                 $ 750.0
Debt instrument, maturity date               Oct. 01, 2022  
Debt instrument, interest rate, stated percentage               4.00% 4.00%
Interest payable dates               April 1 and October 1  
Financing fees                 $ 8.9
2017 Senior Notes [Member] | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Repayments of unsecured debt $ 750.0                
Write-off of deferred financing fees 3.2                
Debt call premium $ 7.5                
2020-1 Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Unsecured senior notes         $ 1,000.0        
Debt instrument, maturity date               Feb. 15, 2027  
2020-2 Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Unsecured senior notes     $ 500.0            
Percentage of face value price for issuance of senior notes     99.50%            
2020 Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, maturity date               Feb. 15, 2027  
Debt instrument, interest rate, stated percentage         3.875%     3.875%  
Interest payable dates               February 1 and August 1  
Financing fees         $ 18.0        
Redemption period               Feb. 15, 2023  
Aggregate redemption price, percentage               35.00%  
Redemption price, percentage               103.875%  
2020 Senior Notes [Member] | Redemption, Period One [Member]                  
Debt Instrument [Line Items]                  
Redemption period               Feb. 15, 2023  
Redemption price, percentage               101.938%  
2020 Senior Notes [Member] | Redemption, Period Two [Member]                  
Debt Instrument [Line Items]                  
Redemption period               Feb. 15, 2024  
Redemption price, percentage               100.969%  
2020 Senior Notes [Member] | Redemption, Period Three [Member]                  
Debt Instrument [Line Items]                  
Redemption period               Feb. 15, 2025  
Redemption price, percentage               100.00%  
2021 Senior Notes [Member] | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Unsecured senior notes   $ 1,500.0              
Debt instrument, maturity date   Feb. 01, 2029              
Debt instrument, interest rate, stated percentage   3.125%              
Interest payable dates   February 1 and August 1              
Financing fees   $ 14.3              
Redemption period   Feb. 01, 2024              
Aggregate redemption price, percentage   35.00%              
Redemption price, percentage   103.125%              
2021 Senior Notes [Member] | Redemption, Period One [Member] | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Redemption period   Feb. 01, 2024              
Redemption price, percentage   101.563%              
2021 Senior Notes [Member] | Redemption, Period Two [Member] | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Redemption period   Feb. 01, 2025              
Redemption price, percentage   100.781%              
2021 Senior Notes [Member] | Redemption, Period Three [Member] | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Redemption period   Feb. 01, 2026              
Redemption price, percentage   100.00%              
Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Ratio of indebtedness to annualized consolidated adjusted EBITDA               9.5