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Earnings Per Share
 9 Months Ended
Sep. 30, 2021
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,
 2020202120202021
Numerator  
Net income (controlling interest)$71.3 $128.4 $86.3 $387.3 
Interest expense on junior convertible securities, net of taxes— 4.6 — 13.9 
Net income (controlling interest), as adjusted$71.3 $133.0 $86.3 $401.2 
Denominator    
Average shares outstanding (basic)46.3 41.1 47.1 41.8 
Effect of dilutive instruments:    
Stock options and restricted stock units0.2 1.1 0.1 0.9 
Junior convertible securities— 2.1 — 2.1 
Average shares outstanding (diluted)46.5 44.3 47.2 44.8 
Average shares outstanding (diluted) in the table above excludes stock options and restricted stock units that have not met certain performance conditions and items 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,
 2020202120202021
Stock options and restricted stock units2.9 0.1 3.1 0.2 
Junior convertible securities2.2 — 2.2 — 
The Company may settle portions of its Affiliate equity purchases in shares of its common stock. Because it is the Company’s intention to settle these potential purchases in cash, the calculation of Average shares outstanding (diluted) excludes any potential dilutive effect from possible share settlements of Affiliate equity purchases.
For the three and nine months ended September 30, 2021, under its authorized share repurchase programs, the Company repurchased 0.6 million and 2.8 million shares of its common stock, respectively, at an average price per share of $161.02 and $141.58, respectively.