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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Financial Data By Reportable Segment
Financial data by reportable segment for the three and nine months ended September 30, 2017 and 2016 is as follows:
 
Commercial
& Specialty
Business
 
Government
Business
 
Other
 
Total
Three months ended September 30, 2017
 
 
 
 
 
 
 
Operating revenue
$
10,052.1

 
$
12,037.3

 
$
7.3

 
$
22,096.7

Operating gain (loss)
534.6

 
457.5

 
(10.1
)
 
982.0

Three months ended September 30, 2016
 
 
 
 
 
 
 
Operating revenue
$
9,656.8

 
$
11,462.4

 
$
6.0

 
$
21,125.2

Operating gain (loss)
637.7

 
478.9

 
(38.5
)
 
1,078.1

Nine Months Ended September 30, 2017
 
 
 
 
 
 
 
Operating revenue
$
30,650.5

 
$
35,946.4

 
$
17.3

 
$
66,614.2

Operating gain (loss)
2,804.9

 
1,069.4

 
(79.9
)
 
3,794.4

Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Operating revenue
$
29,064.9

 
$
33,627.4

 
$
16.8

 
$
62,709.1

Operating gain (loss)
3,006.0

 
1,254.4

 
(111.7
)
 
4,148.7
Reconciliation Of Reportable Segments Operating Revenues To Total Revenues Reported In The Consolidated Statements Of Income
A reconciliation of reportable segments' operating revenues to the amounts of total revenues included in our consolidated statements of income for the three and nine months ended September 30, 2017 and 2016 is as follows:
 
Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
 
2017
 
2016
 
2017
 
2016
Reportable segments' operating revenues
$
22,096.7

 
$
21,125.2

 
$
66,614.2

 
$
62,709.1

Net investment income
220.2

 
200.9

 
627.6

 
566.9

Net realized gains (losses) on financial instruments
114.7

 
88.8

 
138.2

 
(23.8
)
Other-than-temporary impairment losses recognized in income
(5.6
)
 
(11.0
)
 
(20.9
)
 
(103.6
)
Total revenues
$
22,426.0

 
$
21,403.9

 
$
67,359.1

 
$
63,148.6
Reconciliation Of Reportable Segments Operating Gain To Income Before Income Tax Expense Included In The Consolidated Statements Of Income
A reconciliation of reportable segments' operating gain to income before income tax expense included in our consolidated statements of income for the three and nine months ended September 30, 2017 and 2016 is as follows:
 
Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
 
2017
 
2016
 
2017
 
2016
Reportable segments' operating gain
$
982.0

 
$
1,078.1

 
$
3,794.4

 
$
4,148.7

Net investment income
220.2

 
200.9

 
627.6

 
566.9

Net realized gains (losses) on financial instruments
114.7

 
88.8

 
138.2

 
(23.8
)
Other-than-temporary impairment losses recognized in income
(5.6
)
 
(11.0
)
 
(20.9
)
 
(103.6
)
Interest expense
(150.5
)
 
(172.9
)
 
(575.4
)
 
(545.7
)
Amortization of other intangible assets
(41.9
)
 
(47.4
)
 
(124.3
)
 
(145.7
)
Income before income tax expense
$
1,118.9

 
$
1,136.5

 
$
3,839.6

 
$
3,896.8