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SEGMENT INFORMATION (Segment Information) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 666.3 | $ 667.4 | $ 678.1 | $ 651.8 | $ 624.6 | $ 613.4 | $ 613.9 | $ 584.5 | $ 2,663.6 | $ 2,436.4 | $ 2,303.9
Operating income | 176.9 | $ 174.3 | $ 188.5 | $ 154.2 | 165.2 | $ 153.7 | $ 167.4 | $ 151.9 | 693.9 | 638.2 | 611.2
Total Assets | 4,509.0 |  |  |  | 4,661.0 |  |  |  | 4,509.0 | 4,661.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 198.0 | 201.8 | 189.6
Capital expenditures |  |  |  |  |  |  |  |  | 146.2 | 86.4 | 83.3
Expenditures to Acquire Productive Assets |  |  |  |  |  |  |  |  | 150.7 |  |
U.S. Information Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,171.3 | 1,079.9 | 1,054.5
Operating income |  |  |  |  |  |  |  |  | 491.2 | 421.0 | 401.3
Total Assets | 1,869.6 |  |  |  | 1,931.3 |  |  |  | 1,869.6 | 1,931.3 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 83.3 | 86.7 | 88.8
Capital expenditures |  |  |  |  |  |  |  |  | 21.9 | 16.6 | 16.7
International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 568.5 | 572.2 | 497.8
Operating income |  |  |  |  |  |  |  |  | 113.5 | 121.0 | 145.3
Total Assets | 830.2 |  |  |  | 965.3 |  |  |  | 830.2 | 965.3 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 40.1 | 44.2 | 24.1
Capital expenditures |  |  |  |  |  |  |  |  | 25.7 | 15.2 | 19.7
Workforce Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 577.7 | 490.1 | 474.1
Operating income |  |  |  |  |  |  |  |  | 218.8 | 160.7 | 142.6
Total Assets | 1,268.5 |  |  |  | 1,271.3 |  |  |  | 1,268.5 | 1,271.3 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 42.0 | 42.6 | 51.7
Capital expenditures |  |  |  |  |  |  |  |  | 22.1 | 13.1 | 14.6
Personal Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 346.1 | 294.2 | 277.5
Operating income |  |  |  |  |  |  |  |  | 95.2 | 93.4 | 79.3
Total Assets | 197.9 |  |  |  | 194.9 |  |  |  | 197.9 | 194.9 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 9.4 | 8.2 | 7.5
Capital expenditures |  |  |  |  |  |  |  |  | 11.2 | 9.2 | 6.9
General Corporate Expense |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (224.8) | (157.9) | (157.3)
Total Assets | $ 342.8 |  |  |  | $ 298.2 |  |  |  | 342.8 | 298.2 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 23.2 | 20.1 | 17.5
Capital expenditures |  |  |  |  |  |  |  |  | $ 69.8 | $ 32.3 | $ 25.4

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