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Earnings Per Share
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
The calculation of basic earnings per share is based on the weighted average number of shares of the Company’s common stock outstanding during the period. Diluted earnings per share is similar to basic earnings per share, 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,
 
2016
 
2017
 
2016
 
2017
Numerator
 
 
 
 
 
 
 
Net income (controlling interest)
$
110.2

 
$
125.4

 
$
322.5

 
$
374.2

Interest expense on convertible securities, net of taxes
3.9

 
3.9

 
11.6

 
11.6

Net income (controlling interest), as adjusted
$
114.1

 
$
129.3

 
$
334.1

 
$
385.8

Denominator
 
 
 
 
 
 
 
Average shares outstanding (basic)
53.9

 
55.8

 
53.9

 
56.3

Effect of dilutive instruments:
 
 
 
 
 
 
 
Stock options and restricted stock units
0.5

 
0.3

 
0.5

 
0.3

Junior convertible securities
2.2

 
2.2

 
2.2

 
2.2

Average shares outstanding (diluted)
56.6

 
58.3

 
56.6

 
58.8


Average shares outstanding (diluted) in the table above exclude share awards that have not satisfied performance conditions and the anti-dilutive effect of the following shares:
 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
 
2016
 
2017
 
2016
 
2017
Stock options and restricted stock units
0.5

 
0.0

 
0.7

 
0.1

Shares subject to forward sale agreement
2.0

 
—

 
2.0

 
—


The Company may settle portions of its Affiliate equity purchases in shares of its common stock. Because it is the Company’s intent to settle these potential purchases in cash, the calculation of diluted earnings per share excludes any potential dilutive effect from possible share settlements of Affiliate equity purchases.
In the three and nine months ended September 30, 2017, the Company repurchased 0.4 million and 1.7 million shares, respectively, at an average price per share of $175.68 and $164.00, respectively.