| In millions, except per share items | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Contract revenue | 850.0 | 731.7 | 909.0 | | | | | |
| Contract costs | 874.7 | 685.4 | 868.2 | 1,497.6 | 1,360.0 | 1,653.4 | 1,249.0 | 944.5 |
| Contract income | -24.8 | 46.3 | | | | | | |
| Amortization of intangibles | 9.7 | 9.8 | 9.9 | 9.9 | 9.9 | 12.4 | 15.1 | 9.4 |
| General and administrative | 54.7 | 61.0 | 77.3 | 108.6 | 122.4 | 150.1 | 127.5 | 108.6 |
| Operating loss | -91.3 | -30.7 | -52.1 | -28.4 | 2.8 | 10.4 | -192.1 | -14.0 |
| Interest expense | -16.0 | -14.0 | -27.3 | -30.8 | -31.2 | -29.4 | -45.0 | -27.6 |
| Interest income | 0.0 | 0.5 | 0.1 | 0.4 | | | | |
| Other, net | -2.2 | -6.2 | -18.5 | -6.7 | -0.7 | -0.6 | -0.5 | 1.6 |
| Benefit for income taxes | -1.0 | -0.5 | -54.0 | 0.2 | -4.0 | 4.7 | -33.6 | 14.0 |
| Loss from continuing operations | -1.4 | -4.0 | 96.0 | -5.2 | 20.8 | -27.7 | -210.4 | -14.0 |
| Loss from discontinued operations net of provision for income taxes | | | | | | -2.5 | -83.6 | -23.0 |
| Net loss | -1.4 | -4.0 | 96.0 | -5.2 | 20.8 | -30.2 | -294.0 | -37.0 |
| |
| 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 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| |
| Net loss (in USD per share) | ($1.74) | ($0.77) | $0.54 | ($1.62) | ($0.32) | ($0.63) | ($6.19) | ($0.87) |
| |
| 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 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Net loss (in USD per share) | ($1.74) | ($0.77) | $0.54 | ($1.62) | ($0.32) | ($0.63) | ($6.19) | ($0.87) |
| |
| Weighted average number of common shares outstanding: | | | | | | | | |
| Basic (in shares) | 62.2 | 61.4 | 57.8 | 49.3 | 48.6 | 48.0 | 47.5 | 43.0 |
| Diluted (in shares) | 62.2 | 61.4 | 57.8 | 49.3 | 48.6 | 48.0 | 47.5 | 43.0 |