| 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 |
| | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F |
| Revenue | 831.3 | 877.9 | 819.0 | 717.2 | 677.1 | 660.8 | 565.6 | 407.2 |
| Revenue growth | -5.3% | 7.2% | 14.2% | 5.9% | 2.5% | 16.8% | 38.9% | 42.6% |
| Operating expenses: | | | | | | | | |
| Ship operating | 183.9 | 192.3 | 193.8 | 166.1 | 150.1 | | | |
| Cost of services, supervision fees | 1.3 | 7.4 | 2.0 | | | | | |
| Depreciation and amortization | 199.9 | 216.1 | 204.9 | 181.5 | 172.5 | 165.5 | 140.4 | 101.0 |
| General and administrative | 40.1 | 32.1 | 27.3 | 40.0 | 39.2 | 27.8 | 16.8 | 9.6 |
| Operating leases (note 12) | 115.5 | 85.9 | 40.3 | | | | | |
| Loss (gain) on disposals (note 6) | -13.6 | 31.9 | | | | -9.8 | 16.2 | |
| Expenses related to customer bankruptcy | 1.0 | 19.7 | | | | | | |
| Vessel impairments | | 285.2 | | | | | | |
| Total operating expenses | 528.2 | 870.6 | 468.3 | 387.6 | | | | |
| Operating earnings | 303.1 | 7.3 | 350.8 | 329.5 | 315.4 | 338.6 | 256.5 | 188.5 |
| Operating margin | 36.5% | 0.8% | 42.8% | 46.0% | 46.6% | 51.2% | 45.4% | 46.3% |
| |
| Other expenses (income): | | | | | | | | |
| Interest expense and amortization of deferred financing fees | -116.4 | -119.9 | -108.7 | -98.5 | -60.5 | -72.0 | -50.8 | -28.8 |
| Interest income | -4.6 | -8.5 | -11.0 | -10.7 | -2.0 | -1.2 | -0.9 | |
| Undrawn credit facility fees | 2.2 | 2.7 | 3.1 | 3.1 | 2.7 | 1.5 | 4.3 | 4.5 |
| Refinancing expenses | | 2.0 | 5.8 | 0.1 | | | | |
| Change in fair value of financial instruments (note 19(c)) | 12.6 | 29.1 | 54.6 | 105.7 | -60.5 | 136.0 | 281.0 | 241.0 |
| Equity income on investment (note 8) | -5.8 | -0.2 | -5.1 | -0.3 | 0.7 | 0.3 | 1.2 | |
| Other expense (income) | 7.1 | 1.3 | -4.6 | 1.8 | 1.5 | -0.2 | -339.9 | -276.2 |
| Total other expenses (income) | 127.9 | 146.3 | 151.4 | -198.3 | -16.3 | -217.3 | -339.9 | -276.2 |
| Net earnings (loss) | 175.2 | -139.0 | 199.4 | 131.2 | 299.0 | 121.3 | -83.4 | -87.7 |
| |
| Earnings (loss) per share (note 14): | | | | | | | | |
| Class A common share, basic | $0.94 | ($1.89) | $1.46 | $0.80 | $3.36 | $0.84 | ($2.04) | ($1.70) |
| Class A common share, diluted | $0.94 | ($1.89) | $1.46 | $0.79 | $2.93 | $0.81 | ($2.04) | ($1.70) |