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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Earnings (Loss) Per Share
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 June 30,For the Six Months Ended June 30,
 2020202120202021
Numerator  
Net income (controlling interest)$30.7 $109.0 $15.1 $258.9 
Interest expense on junior convertible securities, net of taxes— 4.6 — 9.4 
Net income (controlling interest), as adjusted$30.7 $113.6 $15.1 $268.3 
Denominator    
Average shares outstanding (basic)47.2 41.6 47.5 42.1 
Effect of dilutive instruments:    
Stock options and restricted stock units0.1 0.9 0.1 0.8 
Junior convertible securities— 2.1 — 2.1 
Average shares outstanding (diluted)47.3 44.6 47.6 45.0 
Schedule of Shares Excluded from Calculation of Basic and Diluted Earnings (Loss) Per Share The following is a summary of items excluded from the denominator in the table above:
 For the Three Months Ended June 30,For the Six Months Ended June 30,
 2020202120202021
Stock options and restricted stock units3.2 0.3 3.2 0.3 
Junior convertible securities2.2 — 2.2 —