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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2017
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 per share available to common stockholders.
 
For the Three Months Ended March 31,
 
2016
 
2017
Numerator
 
 
 
Net income (controlling interest)
$
104.0

 
$
122.5

Interest expense on convertible securities, net of taxes
3.8

 
3.8

Net income (controlling interest), as adjusted
$
107.8

 
$
126.3

Denominator
 
 
 
Average shares outstanding (basic)
54.0

 
56.7

Effect of dilutive instruments:
 
 
 
Stock options and restricted stock
0.4

 
0.3

Junior convertible securities
2.2

 
2.2

Average shares outstanding (diluted)
56.6

 
59.2

Schedule of Shares Excluded from Calculation of Basic and Diluted Earnings Per Share
Average shares outstanding (diluted) in the table above exclude the anti-dilutive effect of the following shares:
 
For the Three Months Ended March 31,
 
2016
 
2017
Stock options and restricted stock units
0.7

 
0.2