| 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 costs | 905.8 | 874.7 | 784.6 | 694.5 | 662.4 | 685.4 | 736.0 | 782.0 |
| Amortization of intangibles | 9.6 | 9.7 | 9.7 | 9.7 | 9.7 | 9.8 | 9.8 | 9.8 |
| General and administrative | 54.8 | 55.4 | 54.9 | 57.3 | 57.9 | 61.0 | 62.5 | 66.5 |
| Operating loss | -87.0 | -91.3 | -54.4 | -33.0 | -36.1 | -30.7 | -23.9 | -30.0 |
| Interest expense | -19.1 | -16.0 | -14.5 | -14.3 | -13.9 | -14.0 | -16.7 | -19.3 |
| Interest income | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 0.5 | 0.5 | 0.5 |
| Other, net | -2.2 | -2.2 | -6.2 | -6.2 | -6.2 | -6.2 | -18.3 | -18.3 |
| Benefit for income taxes | -0.6 | -1.0 | -3.3 | -3.7 | -1.3 | -0.5 | -31.7 | -32.6 |
| Loss from continuing operations | -0.4 | -1.4 | -25.8 | -3.8 | -8.4 | -4.0 | 28.5 | 41.3 |
| Loss from discontinued operations net of provision for income taxes | -0.2 | 0.0 | 2.3 | 2.5 | 1.8 | 0.0 | -3.8 | |
| Net loss | -0.6 | -1.4 | -23.5 | -1.3 | -6.6 | -4.0 | 24.6 | 38.8 |
| |
| 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) | ($1.72) | ($1.74) | ($1.07) | ($0.72) | ($0.80) | ($0.76) | $0.80 | $0.70 |
| |
| 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) | ($1.72) | ($1.74) | ($1.07) | ($0.72) | ($0.80) | ($0.76) | $0.80 | $0.70 |
| |
| Weighted average number of common shares outstanding: | | | | | | | | |
| Basic (in shares) | 62.3 | 62.1 | 61.9 | 61.8 | 61.5 | 61.3 | 60.4 | 60.0 |
| Diluted (in shares) | 62.3 | 62.1 | 61.9 | 61.8 | 61.5 | 61.3 | 60.4 | 60.0 |