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Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 10, 2022
Jun. 04, 2019
Mar. 31, 2021
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Feb. 15, 2022
Sep. 22, 2020
Jun. 08, 2018
Feb. 28, 2015
Debt Instrument [Line Items]                    
Long-term Debt       $ 1,387,500,000   $ 1,386,900,000        
Interest and other expenses       14,100,000 $ 12,700,000          
Interest paid, including capitalized interest, operating and investing activities       24,800,000 $ 22,000,000          
Derivative, Gain on Derivative       5,900,000            
2.400% Senior Notes due September 30, 2030                    
Debt Instrument [Line Items]                    
Long-term Debt               $ 395,800,000    
Senior Notes, 3.800 Percent Due February 23, 2033                    
Debt Instrument [Line Items]                    
Long-term Debt             $ 395,100,000      
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062                    
Debt Instrument [Line Items]                    
Long-term Debt $ 144,700,000                  
Senior Notes | 4.350% Senior Notes due February 15, 2025                    
Debt Instrument [Line Items]                    
Long-term Debt       $ 449,400,000   449,300,000        
Stated interest rate       4.35%            
Long-term debt, gross       $ 450,000,000            
Face amount of debt                   $ 250,000,000
Increase in senior notes     $ 200,000,000              
Senior Notes | 2.400% Senior Notes due September 30, 2030                    
Debt Instrument [Line Items]                    
Long-term Debt       396,700,000   396,600,000        
Stated interest rate               2.40%    
Long-term debt, gross       400,000,000            
Effective interest rate               2.52%    
Senior Notes | Senior Notes, 3.800 Percent Due February 23, 2033                    
Debt Instrument [Line Items]                    
Long-term Debt       395,600,000   395,500,000        
Stated interest rate             3.80%      
Long-term debt, gross       400,000,000            
Effective interest rate               3.95%    
Senior Notes | 5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062                    
Debt Instrument [Line Items]                    
Long-term debt, gross       150,000,000            
Senior Notes | Senior Notes, 5.875 Percent Due March 15, 2062                    
Debt Instrument [Line Items]                    
Long-term Debt       145,800,000   $ 145,500,000        
Junior Debt | Senior Notes, 5.875 Percent Due March 15, 2062                    
Debt Instrument [Line Items]                    
Stated interest rate 5.875%                  
Junior Debt | Senior Notes, 5.875 Percent Due March 15, 2062 | Five-Year Treasury Rate                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate 4.14%                  
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   $ 800,000,000             $ 600,000,000  
Increase in revolving credit borrowing capacity   $ 200,000,000                
Line of credit facility, amount outstanding       $ 0