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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2016 and 2017:
 
 
2016
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Revenue
 
$
545.4

 
$
554.1

 
$
544.7

 
$
550.3

Operating income
 
246.8

 
247.0

 
238.5

 
301.9

Income before income taxes
 
230.5

 
235.9

 
226.2

 
281.9

Net income (controlling interest)
 
104.0

 
108.3

 
110.2

 
150.2

Earnings per share (diluted)
 
$
1.90

 
$
1.98

 
$
2.02

 
$
2.67

 
 
2017
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter(1)
Revenue
 
$
544.3

 
$
570.9

 
$
585.7

 
$
604.1

Operating income
 
262.5

 
275.9

 
289.5

 
280.0

Income before income taxes
 
253.3

 
266.9

 
282.9

 
264.0

Net income (controlling interest)
 
122.5

 
126.3

 
125.4

 
315.4

Earnings per share (diluted)
 
$
2.13

 
$
2.22

 
$
2.22

 
$
5.50


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(1) 
In the fourth quarter of 2017, the Company recorded a provisional one-time net benefit from changes in U.S tax laws (see Note 22) and an expense associated with the impairment of one of its Affiliates accounted for under the equity method (see Note 13).