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Correction to previously issued financial statements - Segment Adjustments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net sales | $ 260.3 | $ 245.4 | $ 478.8 | $ 445.0 |  |
Segment operating profits | 57.1 | 49.2 | 97.0 | 88.5 |  |
Performance Materials |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net sales | 89.5 | 74.2 | 172.9 | 144.3 |  |
Segment operating profits | 30.7 | 26.2 | 60.2 | 56.9 |  |
Performance Chemicals |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net sales | 170.8 | 171.2 | 305.9 | 300.7 |  |
Segment operating profits | $ 26.4 | 23.0 | $ 36.8 | 31.6 |  |
As reported |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net sales |  | 248.7 |  | 452.6 |  |
Segment operating profits |  | 49.1 |  | 85.3 |  |
As reported | Performance Materials |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net sales |  | 74.5 |  | 145.3 |  |
Segment operating profits |  | 26.3 |  | 53.9 |  |
As reported | Performance Chemicals |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net sales |  | 174.2 |  | 307.3 |  |
Segment operating profits |  | 22.8 |  | 31.4 |  |
Increase/(decrease) |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net sales |  | (3.3) |  | (7.6) | $ (9.4) | $ (5.5)
Segment operating profits |  | 0.1 |  | 3.2 |  |
Increase/(decrease) | Performance Materials |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net sales |  | (0.3) |  | (1.0) |  |
Segment operating profits |  | (0.1) |  | 3.0 |  |
Increase/(decrease) | Performance Chemicals |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net sales |  | (3.0) |  | (6.6) |  |
Segment operating profits |  | $ 0.2 |  | $ 0.2 |  |

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