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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share
The following table summarizes the basic and diluted earnings per share calculations (in millions, except per share amounts):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net income attributable to common shareholders - basic
$
89.5

 
$
90.9

 
$
139.7

 
$
140.9

Add: Net income attributable to noncontrolling interests
86.1

 
88.3

 
134.6

 
138.2

Net income available to common shareholders and noncontrolling interests - diluted
$
175.6

 
$
179.2

 
$
274.3

 
$
279.1

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average common shares - basic
235.8

 
233.5

 
235.2

 
231.8

Exchange of noncontrolling interests for common shares (Note 11)
226.9

 
227.2

 
226.9

 
228.5

Effect of other dilutive securities
15.3

 
9.4

 
15.2

 
8.9

Weighted average common shares - diluted
478.0

 
470.1

 
477.3

 
469.2

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.38

 
$
0.39

 
$
0.59

 
$
0.61

Diluted earnings per share
$
0.37

 
$
0.38

 
$
0.57

 
$
0.59

Anti-dilutive securities outstanding
4.2

 
6.4

 
4.2

 
6.4