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Net Income Per Share (Tables)
12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share The following table provides a reconciliation of net income and the number of shares used in basic and diluted earnings per share calculations.
Years Ended December 31:202320222021
Numerator:
Net Income$598.6 $686.4 $1,534.3 
Denominator:
Basic weighted-average shares (a)282,732,526 301,676,941 301,945,319 
Effect of dilutive securities - stock-based compensation awards
2,738,538 1,619,671 1,722,350 
Diluted adjusted weighted-average shares (a)285,471,064303,296,612303,667,669
Earnings per share:Basic$2.12 $2.28 $5.08 
Diluted$2.10 $2.26 $5.05 
Anti-dilutive common stock equivalents excluded from
earnings per share computations:
Stock-based compensation awards
2,234,500 2,645,750 — 
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(a)    In calculating earnings per share, accounting standards require that common shares owned by the ORI 401(k) Savings and Profit Sharing Plan that are unallocated to participants in the plan be excluded from the calculation. Such shares are issued and outstanding and have the same voting and other rights applicable to all other common shares.