| In millions, except per share items | Mar-31-18 | Dec-31-17 | Sep-30-17 | Jun-30-17 | Mar-31-17 | Dec-31-16 | Sep-30-16 | Jun-30-16 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Contract revenue | 201.0 | 217.9 | 240.8 | | 163.9 | 164.4 | 174.8 | |
| Contract costs | 193.3 | 249.2 | 253.0 | 210.4 | 162.2 | 159.1 | 162.8 | 178.3 |
| Contract income | 7.7 | -31.3 | -12.2 | | 1.7 | 5.3 | 12.0 | |
| Amortization of intangibles | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 |
| General and administrative | 13.5 | 14.4 | 13.0 | 13.9 | 14.1 | 14.0 | 15.4 | 14.5 |
| Operating loss | -10.5 | -49.1 | -27.8 | 0.4 | -14.9 | -12.1 | -6.3 | -2.7 |
| Interest expense | -6.5 | -5.0 | -3.8 | -3.7 | -3.5 | -3.5 | -3.6 | -3.3 |
| Interest income | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 |
| Other, net | 0.0 | -2.2 | 0.0 | 0.0 | 0.0 | -6.2 | 0.0 | 0.1 |
| Loss from continuing operations before income taxes | -17.0 | 53.2 | -31.6 | | -18.3 | 28.6 | -9.9 | |
| Benefit for income taxes | -0.2 | 0.7 | 1.1 | -2.2 | -0.6 | -1.7 | 0.8 | 0.2 |
| Loss from continuing operations | -16.7 | 50.1 | -32.7 | -1.1 | -17.7 | 25.7 | -10.7 | -5.8 |
| Loss from discontinued operations net of provision for income taxes | -0.2 | 1.5 | -1.5 | 0.0 | 0.0 | 3.8 | -1.3 | -0.7 |
| Net loss | -17.0 | 51.6 | -34.2 | -1.1 | -17.8 | 29.6 | -12.0 | -6.4 |
| |
| Basic loss per share attributable to Company shareholders: | | | | | | | | |
| Loss from continuing operations (in USD per share) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Loss from discontinued operations (in USD per share) | | | 0.0 | | | | 0.0 | 0.0 |
| |
| Net loss (in USD per share) | ($0.27) | ($0.89) | ($0.54) | ($0.02) | ($0.29) | ($0.22) | ($0.19) | ($0.10) |
| |
| Diluted loss per share attributable to Company shareholders: | | | | | | | | |
| Loss from continuing operations (in USD per share) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Loss from discontinued operations (in USD per share) | | | 0.0 | | | | 0.0 | 0.0 |
| Net loss (in USD per share) | ($0.27) | ($0.89) | ($0.54) | ($0.02) | ($0.29) | ($0.22) | ($0.19) | ($0.10) |
| |
| Weighted average number of common shares outstanding: | | | | | | | | |
| Basic (in shares) | 62.4 | 62.2 | 62.3 | 62.2 | 61.8 | 61.4 | 61.6 | 61.3 |
| Diluted (in shares) | 62.4 | 62.2 | 62.3 | 62.2 | 61.8 | 61.4 | 61.6 | 61.3 |