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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Earnings Per Share The following is a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings (loss) per share available to common stockholders:
 
For the Three Months Ended March 31,
 
2019
 
2020
Numerator
 
 
 
Net loss (controlling interest)
$
(200.8
)
 
$
(15.6
)
Interest expense on junior convertible securities, net of taxes
—

 
—

Net loss (controlling interest), as adjusted
$
(200.8
)
 
$
(15.6
)
Denominator
 
 
 
Average shares outstanding (basic)
51.9

 
47.8

Effect of dilutive instruments:
 
 
 
Stock options and restricted stock units
—

 
—

Average shares outstanding (diluted)
51.9

 
47.8
Schedule of Shares Excluded from Calculation of Basic and Diluted Earnings Per Share The following is a summary of all items excluded from the denominator in the table above:
 
For the Three Months Ended March 31,
 
2019
 
2020
Stock options and restricted stock units
0.6

 
3.3

Junior convertible securities
2.2

 
2.2