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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly results of operations
The following is a summary of the quarterly results of operations of the Company for the years ended December 31, 2012 and 2013.
 
2012
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Revenue
$
417.6

 
$
429.6

 
$
467.3

 
$
491.0

Operating income
108.8

 
25.0

 
139.7

 
126.9

Income before income taxes
117.7

 
62.9

 
137.5

 
177.1

Net income (controlling interest)
37.5

 
6.6

 
54.9

 
75.0

Earnings per share—diluted
$
0.71

 
$
0.12

 
$
1.04

 
$
1.40

 
 
2013
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Revenue
$
502.2

 
$
541.0

 
$
551.6

 
$
594.0

Operating income
150.5

 
161.4

 
169.1

 
153.1

Income before income taxes
167.3

 
172.4

 
187.4

 
336.6

Net income (controlling interest)
62.4

 
64.7

 
75.2

 
158.2

Earnings per share—diluted
$
1.15

 
$
1.18

 
$
1.37

 
$
2.79