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SEGMENT INFORMATION - Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 1,118.5 | $ 1,068.3 | $ 982.8 | $ 957.9 | $ 905.8 | $ 875.7 | $ 880.0 | $ 846.1 | $ 4,127.5 | $ 3,507.6 | $ 3,412.1
Operating income | 169.5 | $ 204.4 | $ 166.8 | $ 135.9 | 47.0 | $ 121.6 | $ 113.8 | $ (617.9) | 676.6 | (335.4) | 448.0
Total assets | 9,611.8 |  |  |  | 7,909.0 |  |  |  | 9,611.8 | 7,909.0 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 391.0 | 331.1 | 310.4
Capital expenditures |  |  |  |  |  |  |  |  | 430.7 | 375.9 | 368.1
General Corporate Expense |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (591.7) | (1,293.0) | (503.6)
Total assets | 2,146.0 |  |  |  | 1,395.2 |  |  |  | 2,146.0 | 1,395.2 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 56.7 | 62.9 | 52.0
Capital expenditures |  |  |  |  |  |  |  |  | 161.8 | 155.0 | 148.3
U.S. Information Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,482.5 | 1,277.4 | 1,247.3
Operating income |  |  |  |  |  |  |  |  | 463.9 | 423.4 | 441.7
Total assets | 2,177.1 |  |  |  | 1,922.9 |  |  |  | 2,177.1 | 1,922.9 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 114.4 | 81.8 | 79.2
Capital expenditures |  |  |  |  |  |  |  |  | 94.2 | 67.6 | 42.0
Workforce Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,437.9 | 949.7 | 826.8
Workforce Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,437.9 | 949.7 | 826.8
Operating income |  |  |  |  |  |  |  |  | 700.7 | 389.7 | 332.7
Total assets | 1,601.3 |  |  |  | 1,338.6 |  |  |  | 1,601.3 | 1,338.6 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 69.7 | 53.6 | 45.8
Capital expenditures |  |  |  |  |  |  |  |  | 73.3 | 50.5 | 44.0
International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 862.1 | 920.6 | 966.2
International | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 862.1 | 920.6 | 966.2
Operating income |  |  |  |  |  |  |  |  | 66.7 | 96.1 | 108.6
Total assets | 3,368.3 |  |  |  | 2,977.0 |  |  |  | 3,368.3 | 2,977.0 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 131.6 | 117.8 | 118.5
Capital expenditures |  |  |  |  |  |  |  |  | 64.7 | 76.8 | 104.4
Global Consumer Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 345.0 | 359.9 | 371.8
Global Consumer Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 345.0 | 359.9 | 371.8
Operating income |  |  |  |  |  |  |  |  | 37.0 | 48.4 | 68.6
Total assets | $ 319.1 |  |  |  | $ 275.3 |  |  |  | 319.1 | 275.3 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 18.6 | 15.0 | 14.9
Capital expenditures |  |  |  |  |  |  |  |  | $ 36.7 | $ 26.0 | $ 29.4

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