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Common Stock and Earnings Per Share - Summary of Common Stock (Details) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Summary of Common Stock [Line Items]      
Beginning balance (in shares) 57,200    
Ending balance (in shares) 57,600 57,200  
Common Stock      
Summary of Common Stock [Line Items]      
Beginning balance (in shares) 57,237 53,220 52,085
Employee Stock Purchase Plan (in shares) 16 11 17
Invest Direct (in shares) 232 244 263
Share-Based Compensation (in shares) 76 82 73
Equity Issuance Program (in shares)   3,680 782
Ending balance (in shares) 57,561 57,237 53,220
Beginning balance $ 1,781.5 $ 1,536.7 $ 1,460.9
Employee Stock Purchase Plan 0.8 0.9 0.8
Invest Direct 13.3 14.9 17.5
Share-Based Compensation 8.1 5.3 6.5
Equity Issuance   223.7 51.0
Ending balance $ 1,803.7 $ 1,781.5 $ 1,536.7