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Borrowings - Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2014
Mar. 31, 2013
Jan. 31, 2013
Debt Instrument [Line Items]                      
Interest Expense   $ 17,200,000 $ 19,700,000 $ 34,400,000 $ 39,400,000            
3.875% Senior Notes Due 2/01/2023                      
Debt Instrument [Line Items]                      
Interest rate (percent) 3.875% 3.875%   3.875%              
5.625% Senior Notes Due 3/30/2043                      
Debt Instrument [Line Items]                      
Interest rate (percent)   5.625%   5.625%              
5.650% Senior Notes Due 9/15/2048                      
Debt Instrument [Line Items]                      
Interest rate (percent)   5.65%   5.65%              
3.500% Senior Notes Due 9/19/2029                      
Debt Instrument [Line Items]                      
Interest rate (percent)   3.50%   3.50%              
Senior Notes                      
Debt Instrument [Line Items]                      
Interest Expense $ 10,100,000                    
Senior Notes | 3.875% Senior Notes Due 2/01/2023                      
Debt Instrument [Line Items]                      
Interest rate (percent)   3.875%   3.875%              
Aggregate Principal Amount $ 250,000,000 $ 0   $ 0              
Fair Value   0   0   $ 0          
Interest Expense   0 2,500,000 0 5,000,000.0            
Senior notes percentage of par value (percent)                     99.966%
Senior Notes | 5.625% Senior Notes Due 3/30/2043                      
Debt Instrument [Line Items]                      
Aggregate Principal Amount   600,000,000.0   600,000,000.0         $ 200,000,000 $ 400,000,000  
Fair Value   581,900,000   581,900,000   795,500,000          
Interest Expense   8,400,000 8,400,000 16,900,000 16,900,000            
Senior notes percentage of par value (percent)                 104.315% 99.583%  
Senior Notes | 5.650% Senior Notes Due 9/15/2048                      
Debt Instrument [Line Items]                      
Aggregate Principal Amount   350,000,000.0   350,000,000.0              
Fair Value   346,400,000   346,400,000   484,700,000          
Interest Expense   $ 5,000,000.0 5,000,000.0 $ 9,900,000 9,900,000            
Senior notes percentage of par value (percent)               99.914%      
Senior Notes | 3.500% Senior Notes Due 9/19/2029                      
Debt Instrument [Line Items]                      
Interest rate (percent)   3.50%   3.50%              
Aggregate Principal Amount   $ 425,000,000.0   $ 425,000,000.0              
Fair Value   390,300,000   390,300,000   $ 457,400,000          
Interest Expense   $ 3,800,000 $ 3,800,000 $ 7,600,000 $ 7,600,000            
Senior notes percentage of par value (percent)             99.841%