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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Financial Data By Reportable Segment
Financial data by reportable segment for the three and nine months ended September 30, 2013 and 2012 is as follows (amounts reported for prior periods have been reclassified to conform to our new segment reporting structure):
 
Commercial
and Specialty
Business
 
Government
Business
 
Other
 
Total
Three Months Ended September 30, 2013:
 
 
 
 
 
 
 
Operating revenue from external customers
$
9,789.1

 
$
7,931.1

 
$
12.8

 
$
17,733.0

Operating gain (loss)
688.2

 
326.5

 
(5.3
)
 
1,009.4

Three Months Ended September 30, 2012:
 
 
 
 
 
 
 
Operating revenue from external customers
$
9,751.2

 
$
5,374.1

 
$
8.4

 
$
15,133.7

Operating gain (loss)
852.3

 
169.0

 
(17.5
)
 
1,003.8

Nine Months Ended September 30, 2013:
 
 
 
 
 
 
 
Operating revenue from external customers
$
29,358.7

 
$
23,493.5

 
$
24.3

 
$
52,876.5

Operating gain (loss)
2,869.9

 
757.6

 
(18.8
)
 
3,608.7

Nine Months Ended September 30, 2012:
 
 
 
 
 
 
 
Operating revenue from external customers
$
29,391.7

 
$
16,039.2

 
$
26.3

 
$
45,457.2

Operating gain (loss)
2,863.2

 
381.8

 
(36.9
)
 
3,208.1
Reconciliation Of Reportable Segments Operating Revenues To Total Revenues Reported In The Consolidated Statements Of Income
A reconciliation of reportable segments operating revenues to total revenues reported in the consolidated statements of income for the three and nine months ended September 30, 2013 and 2012 is as follows:
 
Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
 
2013
 
2012
 
2013
 
2012
Reportable segments operating revenues
$
17,733.0

 
$
15,133.7

 
$
52,876.5

 
$
45,457.2

Net investment income
167.6

 
168.6

 
482.8

 
507.0

Net realized gains on investments
95.4

 
54.6

 
166.4

 
232.0

Other-than-temporary impairment losses recognized in income
(26.2
)
 
(3.8
)
 
(73.1
)
 
(20.6
)
Total revenues
$
17,969.8

 
$
15,353.1

 
$
53,452.6

 
$
46,175.6
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 the consolidated statements of income for the three and nine months ended September 30, 2013 and 2012 is as follows:
 
Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
 
2013
 
2012
 
2013
 
2012
Reportable segments operating gain
$
1,009.4

 
$
1,003.8

 
$
3,608.7

 
$
3,208.1

Net investment income
167.6

 
168.6

 
482.8

 
507.0

Net realized gains on investments
95.4

 
54.6

 
166.4

 
232.0

Other-than-temporary impairment losses recognized in income
(26.2
)
 
(3.8
)
 
(73.1
)
 
(20.6
)
Interest expense
(151.5
)
 
(133.6
)
 
(456.9
)
 
(360.3
)
Loss on extinguishment of debt
(145.3
)
 
—

 
(145.3
)
 
—

Amortization of other intangible assets
(66.6
)
 
(63.9
)
 
(202.2
)
 
(182.1
)
Income before income tax expense
$
882.8

 
$
1,025.7

 
$
3,380.4

 
$
3,384.1