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Selected Operating Statement Data by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information |  |
Premium Income | $ 2,250.0 | $ 2,142.9
Net Investment Income | 602.3 | 602.4
Other Income | 49.5 | 50.2
Operating Segments |  |
Segment Reporting Information |  |
Premium Income | 2,250.0 | 2,142.9
Net Investment Income | 602.3 | 602.4
Other Income | 49.5 | 50.2
Adjusted Operating Revenue | 2,901.8 | 2,795.5
Adjusted Operating Income (Loss) | 343.3 | 339.9
Operating Segments | Unum US |  |
Segment Reporting Information |  |
Premium Income | 1,438.8 | 1,360.4
Net Investment Income | 194.2 | 202.5
Other Income | 29.0 | 28.7
Adjusted Operating Revenue | 1,662.0 | 1,591.6
Adjusted Operating Income (Loss) | 243.9 | 239.1
Operating Segments | Unum UK |  |
Segment Reporting Information |  |
Premium Income | 139.6 | 121.3
Net Investment Income | 27.6 | 26.6
Other Income | 0.0 | 0.0
Adjusted Operating Revenue | 167.2 | 147.9
Adjusted Operating Income (Loss) | 29.8 | 26.6
Operating Segments | Colonial Life |  |
Segment Reporting Information |  |
Premium Income | 398.3 | 374.3
Net Investment Income | 37.3 | 35.1
Other Income | 0.3 | 0.3
Adjusted Operating Revenue | 435.9 | 409.7
Adjusted Operating Income (Loss) | 81.0 | 82.4
Operating Segments | Closed Block |  |
Segment Reporting Information |  |
Premium Income | 273.3 | 286.9
Net Investment Income | 337.7 | 335.3
Other Income | 19.0 | 20.8
Adjusted Operating Revenue | 630.0 | 643.0
Adjusted Operating Income (Loss) | 28.9 | 31.6
Operating Segments | Corporate and Other |  |
Segment Reporting Information |  |
Premium Income | 0.0 | 0.0
Net Investment Income | 5.5 | 2.9
Other Income | 1.2 | 0.4
Adjusted Operating Revenue | 6.7 | 3.3
Adjusted Operating Income (Loss) | $ (40.3) | $ (39.8)

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