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Segment Information
 3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Segment Information
Segment Information
The results of our operations are described through three reportable segments: Commercial and Specialty Business, Government Business and Other, as further described in Note 19, “Segment Information,” to our audited consolidated financial statements as of and for the year ended December 31, 2016 included in our 2016 Annual Report on Form 10-K.
Financial data by reportable segment for the three months ended March 31, 2017 and 2016 is as follows:
 
Commercial
and Specialty
Business
 
Government
Business
 
Other
 
Total
Three Months Ended March 31, 2017
 
 
 
 
 
 
 
Operating revenue
$
10,289.6

 
$
12,025.7

 
$
4.2

 
$
22,319.5

Operating gain (loss)
1,302.4

 
318.6

 
(35.6
)
 
1,585.4

Three Months Ended March 31, 2016
 
 
 
 
 
 
 
Operating revenue
$
9,509.8

 
$
10,793.9

 
$
5.7

 
$
20,309.4

Operating gain (loss)
1,293.0

 
325.0

 
(47.6
)
 
1,570.4


A reconciliation of reportable segments operating revenues to the amounts of total revenues included in the consolidated statements of income for the three months ended March 31, 2017 and 2016 is as follows:
 
Three Months Ended 
 March 31
 
2017
 
2016
Reportable segments operating revenues
$
22,319.5

 
$
20,309.4

Net investment income
207.2

 
171.1

Net realized gains (losses) on financial instruments
7.3

 
(125.1
)
Other-than-temporary impairment losses recognized in income
(8.1
)
 
(66.9
)
Total revenues
$
22,525.9

 
$
20,288.5


A reconciliation of reportable segments operating gain to income before income tax expense included in the consolidated statements of income for the three months ended March 31, 2017 and 2016 is as follows:
 
Three Months Ended 
 March 31
 
2017
 
2016
Reportable segments operating gain
$
1,585.4

 
$
1,570.4

Net investment income
207.2

 
171.1

Net realized gains (losses) on financial instruments
7.3

 
(125.1
)
Other-than-temporary impairment losses recognized in income
(8.1
)
 
(66.9
)
Interest expense
(235.0
)
 
(187.1
)
Amortization of other intangible assets
(41.8
)
 
(50.4
)
Income before income tax expense
$
1,515.0

 
$
1,312.0