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Segment information - Summary of Operations by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 721.7 | $ 683.3 | $ 748.9 | $ 666.8 | $ 789.9 |  | $ 739.2 | $ 764.8 | $ 721.2 | $ 2,820.7 | $ 3,015.1 |  | $ 3,356.4
Operating income (loss) |  |  |  |  |  |  |  |  |  | 47.6 | (55.1) |  | 154.9
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 155.6 | 180.1 |  | 168.6
Total assets | 2,021.6 |  |  |  | 2,130.0 | [1] |  |  |  | 2,021.6 | 2,130.0 | [1] | 2,321.0
Capital expenditures |  |  |  |  |  |  |  |  |  | 147.1 | 213.7 |  | 212.8
Intersegment |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | (22.6) | (49.0) |  | (58.4)
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 208.4 | 174.9 |  | 233.6
Total assets | 1,339.0 |  |  |  | 1,486.0 |  |  |  |  | 1,339.0 | 1,486.0 |  | 1,533.8
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | (22.6) | (49.0) |  | (58.4)
Operating income (loss) |  |  |  |  |  |  |  |  |  | (160.8) | (230.0) |  | (78.7)
Total assets | 682.6 |  |  |  | 644.0 |  |  |  |  | 682.6 | 644.0 |  | 787.2
Capital expenditures |  |  |  |  |  |  |  |  |  | 3.0 | 1.9 |  | 4.9
Services |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 2,406.3 | 2,605.6 |  | 2,785.7
Operating income (loss) |  |  |  |  |  |  |  |  |  | 46.9 | 61.2 |  | 96.0
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 81.8 | 104.8 |  | 103.2
Total assets | 963.3 |  |  |  | 1,081.7 |  |  |  |  | 963.3 | 1,081.7 |  | 1,099.2
Capital expenditures |  |  |  |  |  |  |  |  |  | 74.8 | 143.3 |  | 133.8
Services | Intersegment |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 0.0 | 0.1 |  | 0.3
Services | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 2,406.3 | 2,605.7 |  | 2,786.0
Technology |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 414.4 | 409.5 |  | 570.7
Operating income (loss) |  |  |  |  |  |  |  |  |  | 161.5 | 113.7 |  | 137.6
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 73.8 | 75.3 |  | 65.4
Total assets | $ 375.7 |  |  |  | $ 404.3 |  |  |  |  | 375.7 | 404.3 |  | 434.6
Capital expenditures |  |  |  |  |  |  |  |  |  | 69.3 | 68.5 |  | 74.1
Technology | Intersegment |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 22.6 | 48.9 |  | 58.1
Technology | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 437.0 | $ 458.4 |  | $ 628.8
[1] | Changed to conform to the current-year presentation. See Note 5.

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