XML 94 R82.htm IDEA: XBRL DOCUMENT v3.24.2.u1
Debt - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 15, 2022
USD ($)
Mar. 10, 2022
USD ($)
deferral_period
Jun. 30, 2017
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Mar. 16, 2022
USD ($)
Feb. 15, 2022
USD ($)
Sep. 22, 2020
Feb. 28, 2015
USD ($)
Debt Instrument [Line Items]                        
Long-Term Debt       $ 1,390,400,000   $ 1,390,400,000   $ 1,389,200,000        
Interest and other expenses       13,900,000 $ 14,000,000.0 27,900,000 $ 28,100,000          
Interest paid, including capitalized interest, operating and investing activities       $ 7,300,000 $ 2,500,000 $ 27,300,000 $ 27,300,000          
Senior Notes | Senior Notes, 4.35 Percent Due February 15, 2025                        
Debt Instrument [Line Items]                        
Stated interest rate       4.35%   4.35%            
Long-term debt, gross       $ 450,000,000.0   $ 450,000,000.0            
Face amount of debt                       $ 250,000,000.0
Increase in senior notes     $ 200,000,000.0                  
Long-Term Debt       $ 0   $ 0   449,600,000        
Senior Notes | Senior Notes, 2.400 Percent Due September 30, 2030                        
Debt Instrument [Line Items]                        
Stated interest rate       2.40%   2.40%            
Long-term debt, gross       $ 400,000,000.0   $ 400,000,000.0            
Face amount of debt       395,800,000   395,800,000            
Long-Term Debt       $ 397,300,000   $ 397,300,000   397,000,000.0        
Effective interest rate       2.52%   2.52%            
Senior Notes | Senior Notes, 3.800 Percent Due February 23, 2033                        
Debt Instrument [Line Items]                        
Stated interest rate       3.80%   3.80%            
Long-term debt, gross                   $ 400,000,000    
Long-Term Debt       $ 396,200,000   $ 396,200,000   396,000,000.0   $ 395,100,000    
Effective interest rate                     3.95%  
Junior Subordinated Debt [Member] | 5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062                        
Debt Instrument [Line Items]                        
Stated interest rate       5.875%   5.875%            
Long-term debt, gross   $ 150,000,000                    
Long-Term Debt   $ 144,700,000   $ 147,100,000   $ 147,100,000   $ 146,600,000        
Debt Instrument, Basis Spread on Variable Rate   4.14%                    
Debt Instrument, Interest Deferrals, Number Of Deferral Periods | deferral_period   1                    
Debt Instrument, Interest Deferrals, Period   5 years                    
Revolving Credit Facility | Notes Payable under Revolving Credit Agreement | Second Amended and Restated Credit Agreement                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity $ 600,000,000.0     458,000,000.0   458,000,000.0     $ 800,000,000.0      
Increase in revolving credit borrowing capacity $ 200,000,000.0                      
Line of credit facility, amount outstanding       $ 0   $ 0