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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (Unaudited)
Quarterly Financial Data (Unaudited)
Summarized unaudited quarterly financial data (in millions, except per share data) was as follows:

 
Quarters Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Revenues
$
1,000.6

 
$
918.5

 
$
1,132.7

 
$
1,040.2

 
$
1,208.6

 
$
1,075.7

 
$
1,234.2

 
$
1,111.4

Income from operations
$
336.2

 
$
330.6

 
$
414.4

 
$
424.0

 
$
479.3

 
$
420.5

 
$
506.0

 
$
491.6

Net income
$
166.6

 
$
168.3

 
$
243.5

 
$
247.6

 
$
246.8

 
$
238.6

 
$
578.4

 
$
301.4

Basic earnings per share
$
0.21

 
$
0.22

 
$
0.38

 
$
0.39

 
$
0.39

 
$
0.37

 
$
1.64

 
$
0.50

Diluted earnings per share
$
0.21

 
$
0.21

 
$
0.37

 
$
0.38

 
$
0.37

 
$
0.36

 
$
1.59

 
$
0.50