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Earnings Per Share
 9 Months Ended
Sep. 30, 2022
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The calculation of Earnings per share (basic) is based on the weighted average number of shares of the Company’s common stock outstanding during the period. Earnings per share (diluted) is similar to Earnings per share (basic), but adjusts for the dilutive effect of the potential issuance of incremental shares of the Company’s common stock.
The following is a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per share available to common stockholders:
 For the Three Months Ended September 30,For the Nine Months Ended September 30,
 2021202220212022
Numerator  
Net income (controlling interest)$128.4 $112.6 $387.3 $368.0 
Income from hypothetical settlement of Redeemable non-controlling interests, net of taxes— 5.8 — 43.4 
Interest expense on junior convertible securities, net of taxes4.6 3.4 13.9 10.6 
Net income (controlling interest), as adjusted$133.0 $121.8 $401.2 $422.0 
Denominator    
Average shares outstanding (basic)41.1 38.2 41.8 38.8 
Effect of dilutive instruments:    
Stock options and restricted stock units1.1 1.3 0.9 1.4 
Hypothetical issuance of shares to settle Redeemable non-controlling interests— 2.3 — 5.7 
Junior convertible securities2.1 1.7 2.1 1.9 
Average shares outstanding (diluted)44.3 43.5 44.8 47.8 
Average shares outstanding (diluted) in the table above excludes stock options and restricted stock units that have not met certain performance conditions and instruments that have an anti-dilutive effect on Earnings per share (diluted). The following is a summary of items excluded from the denominator in the table above:
 For the Three Months Ended September 30,For the Nine Months Ended September 30,
 2021202220212022
Stock options and restricted stock units0.1 0.2 0.2 0.2 
Shares issuable to settle Redeemable non-controlling interests— 4.3 — 2.0 
For the three and nine months ended September 30, 2022, under its authorized share repurchase programs, the Company repurchased 0.6 million and 2.5 million shares of its common stock, respectively, at an average price per share of $125.13 and $135.73, respectively.