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SEGMENT INFORMATION - Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 835.3 | $ 834.2 | $ 876.9 | $ 865.7 | $ 838.5 | $ 834.8 | $ 856.7 | $ 832.2 | $ 3,412.1 | $ 3,362.2 | $ 3,144.9
Operating income | 46.1 | $ 64.1 | $ 193.6 | $ 144.2 | 192.6 | $ 154.7 | $ 265.9 | $ 218.6 | 448.0 | 831.7 | 825.1
Total assets | 7,153.2 |  |  |  | 7,233.4 |  |  |  | 7,153.2 | 7,233.4 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 310.4 | 287.8 | 265.4
Capital expenditures |  |  |  |  |  |  |  |  | 368.1 | 214.0 | 191.5
General Corporate Expense |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (503.6) | (314.8) | (231.3)
Total assets | 1,034.8 |  |  |  | 1,019.0 |  |  |  | 1,034.8 | 1,019.0 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 52.0 | 38.9 | 29.4
Capital expenditures |  |  |  |  |  |  |  |  | 148.3 | 91.8 | 87.6
U.S. Information Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,247.3 | 1,262.7 | 1,236.5
Operating income |  |  |  |  |  |  |  |  | 441.7 | 539.1 | 537.0
Total assets | 1,654.8 |  |  |  | 1,587.3 |  |  |  | 1,654.8 | 1,587.3 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 79.2 | 83.7 | 82.1
Capital expenditures |  |  |  |  |  |  |  |  | 42.0 | 18.6 | 19.1
International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 966.2 | 932.3 | 803.6
International | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 966.2 | 932.3 | 803.6
Operating income |  |  |  |  |  |  |  |  | 108.6 | 169.3 | 111.5
Total assets | 2,959.1 |  |  |  | 3,145.7 |  |  |  | 2,959.1 | 3,145.7 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 118.5 | 109.9 | 101.6
Capital expenditures |  |  |  |  |  |  |  |  | 104.4 | 59.7 | 50.3
Workforce Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 826.8 | 764.2 | 702.2
Workforce Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 826.8 | 764.2 | 702.2
Operating income |  |  |  |  |  |  |  |  | 332.7 | 331.9 | 295.5
Total assets | 1,249.5 |  |  |  | 1,227.4 |  |  |  | 1,249.5 | 1,227.4 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 45.8 | 42.1 | 42.7
Capital expenditures |  |  |  |  |  |  |  |  | 44.0 | 28.9 | 22.2
Global Consumer Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 403.0 | 402.6
Operating income |  |  |  |  |  |  |  |  | 68.6 | 106.2 | 112.4
Total assets | $ 255.0 |  |  |  | $ 254.0 |  |  |  | 255.0 | 254.0 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 14.9 | 13.2 | 9.6
Capital expenditures |  |  |  |  |  |  |  |  | $ 29.4 | $ 15.0 | $ 12.3

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