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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2019
Segment Reporting [Abstract]  
Premium Income by Major Line of Business within Each Segment
Segment information is as follows:

Certain prior year amounts were reclassified to conform to current year presentation.

Year Ended December 31
201920182017
(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability$1,823.1  $1,766.2  $1,749.6  
Group Short-term Disability768.8  706.3  639.8  
Group Life and Accidental Death & Dismemberment
Group Life1,662.0  1,583.7  1,467.5  
Accidental Death & Dismemberment165.7  156.3  147.5  
Supplemental and Voluntary
Individual Disability440.7  425.4  420.2  
Voluntary Benefits910.2  895.7  849.4  
Dental and Vision246.1  202.8  169.5  
6,016.6  5,736.4  5,443.5  
Unum International
Unum UK
Group Long-term Disability353.4  358.9  340.3  
Group Life115.7  110.8  103.1  
Supplemental89.5  81.7  69.6  
Unum Poland71.9  17.4  —  
630.5  568.8  513.0  
Colonial Life
Accident, Sickness, and Disability973.4  929.3  884.2  
Life351.6  328.4  300.4  
Cancer and Critical Illness360.0  346.1  326.8  
1,685.0  1,603.8  1,511.4  
Closed Block
Long-term Care651.6  648.3  648.7  
Individual Disability374.3  420.8  471.8  
All Other7.6  8.0  8.7  
1,033.5  1,077.1  1,129.2  
Total Premium Income$9,365.6  $8,986.1  $8,597.1  
Selected Operating Statement Data by Segment
Unum USUnum InternationalColonial LifeClosed BlockCorporateTotal
(in millions of dollars)
Year Ended December 31, 2019
Premium Income$6,016.6  $630.5  $1,685.0  $1,033.5  $—  $9,365.6  
Net Investment Income739.4  122.5  148.0  1,404.9  20.5  2,435.3  
Other Income142.8  0.6  3.4  71.3  3.1  221.2  
Adjusted Operating Revenue$6,898.8  $753.6  $1,836.4  $2,509.7  $23.6  $12,022.1  
Adjusted Operating Income (Loss)$1,031.1  $107.9  $344.5  $137.7  $(188.6) $1,432.6  
Interest and Debt Expense$—  $—  $—  $5.3  $172.1  $177.4  
Depreciation and Amortization$422.8  $18.7  $276.6  $7.7  $1.7  $727.5  
Year Ended December 31, 2018
Premium Income$5,736.4  $568.8  $1,603.8  $1,077.1  $—  $8,986.1  
Net Investment Income778.7  117.2  151.2  1,377.1  29.5  2,453.7  
Other Income118.5  0.4  1.2  75.4  2.7  198.2  
Adjusted Operating Revenue$6,633.6  $686.4  $1,756.2  $2,529.6  $32.2  $11,638.0  
Adjusted Operating Income (Loss)$1,014.6  $113.9  $335.2  $125.5  $(171.1) $1,418.1  
Interest and Debt Expense$—  $—  $—  $6.9  $160.4  $167.3  
Depreciation and Amortization$389.6  $17.6  $257.3  $8.3  $1.0  $673.8  
Year Ended December 31, 2017
Premium Income$5,443.5  $513.0  $1,511.4  $1,129.2  $—  $8,597.1  
Net Investment Income811.2  120.2  144.9  1,354.0  21.4  2,451.7  
Other Income113.2  0.7  1.1  79.8  2.9  197.7  
Adjusted Operating Revenue$6,367.9  $633.9  $1,657.4  $2,563.0  $24.3  $11,246.5  
Adjusted Operating Income (Loss)$1,009.5  $111.7  $325.0  $123.9  $(146.8) $1,423.3  
Interest and Debt Expense$—  $—  $—  $6.7  $153.2  $159.9  
Depreciation and Amortization$371.3  $17.3  $239.9  $6.7  $0.9  $636.1  
Deferred Policy Acquisition Costs by Segment
UnumColonial
Unum USInternationalLifeTotal
(in millions of dollars)
Deferred Acquisition Costs
Year Ended December 31, 2019
Beginning of Year$1,239.4  $20.0  $1,050.0  $2,309.4  
Capitalization334.5  12.8  311.3  658.6  
Amortization(344.0) (7.1) (258.8) (609.9) 
Adjustment Related to Unrealized Investment Gains and Losses(6.9) —  (27.9) (34.8) 
Foreign Currency—  0.7  —  0.7  
End of Year$1,223.0  $26.4  $1,074.6  $2,324.0  
Year Ended December 31, 2018
Beginning of Year$1,205.4  $21.3  $957.9  $2,184.6  
Capitalization344.0  8.1  315.9  668.0  
Amortization(315.1) (8.2) (242.2) (565.5) 
Adjustment Related to Unrealized Investment Gains and Losses5.1  —  18.4  23.5  
Foreign Currency—  (1.2) —  (1.2) 
End of Year$1,239.4  $20.0  $1,050.0  $2,309.4  
Year Ended December 31, 2017
Beginning of Year$1,176.5  $21.4  $896.3  $2,094.2  
Capitalization325.5  7.0  295.5  628.0  
Amortization(293.6) (9.1) (224.4) (527.1) 
Adjustment Related to Unrealized Investment Gains and Losses(3.0) —  (9.5) (12.5) 
Foreign Currency—  2.0  —  2.0  
End of Year$1,205.4  $21.3  $957.9  $2,184.6  
Assets by Segment
December 31
20192018
(in millions of dollars)
Assets
Unum US$18,586.3  $17,510.9  
Unum International3,869.1  3,426.8  
Colonial Life4,629.0  4,237.9  
Closed Block37,008.7  34,527.6  
Corporate2,920.3  2,172.4  
Total Assets$67,013.4  $61,875.6  
Reconciliation of Total Revenue and Income Before Income Tax to Adjusted Operating Revenue and Adjusted Operating Income
A reconciliation of total revenue to "adjusted operating revenue" and income before income tax to "adjusted operating income" is as follows:

Year Ended December 31
201920182017
(in millions of dollars)
Total Revenue  $11,998.9  $11,598.5  $11,286.8  
Excluding:  
Net Realized Investment Gain (Loss) (23.2) (39.5) 40.3  
Adjusted Operating Revenue  $12,022.1  $11,638.0  $11,246.5  
Income Before Income Tax$1,382.1  $627.8  $1,404.0  
Excluding:
Net Realized Investment Gain (Loss) (23.2) (39.5) 40.3  
Long-term Care Reserve Increase—  (750.8) —  
Cost Related to Early Retirement of Debt(27.3) —  —  
Loss from Guaranty Fund Assessment—  —  (20.6) 
Unclaimed Death Benefit Reserve Increase—  —  (39.0) 
Adjusted Operating Income$1,432.6  $1,418.1  $1,423.3