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BUSINESS COMBINATION - CONSIDERATION PAID (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 04, 2016 | May 29, 2015 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Multi-employer withdrawal liabilities |  |  | $ (60.1) |  |  |  | $ (56.2) |  |  | $ (60.1) | $ (56.2) |
Goodwill |  |  | 323.7 |  |  |  | 241.6 |  |  | 323.7 | 241.6 | $ 27.4
Repayments of Span Alaska debt |  |  |  |  |  |  |  |  |  | 81.9 |  |
Estimated future benefit payments |  |  |  |  |  |  |  |  |  |  |  |
Mass withdrawal liability undiscounted payments |  |  | 96.8 |  |  |  |  |  |  | 96.8 |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Expected useful lives | 20 years |  |  |  |  |  |  |  |  |  |  |
Span Alaska |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |
Percentage interest acquired | 100.00% |  |  |  |  |  |  |  |  |  |  |
Number of years in operation | 38 years |  |  |  |  |  |  |  |  |  |  |
Total cash consideration |  |  |  |  |  |  |  |  |  |  |  |
Membership interests | $ 117.0 |  |  |  |  |  |  |  |  |  |  |
Total debt assumed | 81.9 |  |  |  |  |  |  |  |  |  |  |
Total payments | 198.9 |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 4.4 |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | 11.1 |  |  |  |  |  |  |  |  |  |  |
Prepaid and other current assets | 0.9 |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 8.1 |  |  |  |  |  |  |  |  |  |  |
Intangibles – Customer relationships | 79.3 |  |  |  |  |  |  |  |  |  |  |
Intangibles – Trade name | 27.3 |  |  |  |  |  |  |  |  |  |  |
Other long-term assets | 0.1 |  |  |  |  |  |  |  |  |  |  |
Accounts payable | (3.3) |  |  |  |  |  |  |  |  |  |  |
Accruals and other current liabilities | (6.4) |  |  |  |  |  |  |  |  |  |  |
Capital lease obligations | (1.2) |  |  |  |  |  |  |  |  |  |  |
Span Alaska's debt | (81.9) |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets less liabilities | 38.4 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 78.6 |  |  |  |  |  |  |  |  |  |  |
Repayments of Span Alaska debt | 81.9 |  |  |  |  |  |  |  |  |  |  |
Total consideration for membership interests | (117.0) |  |  |  |  |  |  |  |  |  |  |
Condensed Consolidated Statements of Income and Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 22.8 |  |
Operating Income |  |  |  |  |  |  |  |  |  | 3.5 |  |
One-time acquisition related costs |  |  | 0.2 | $ 2.6 | $ 0.1 | $ 0.1 |  |  |  | 3.0 |  |
Span Alaska | Trade Names |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Intangibles – Trade name | 27.3 |  |  |  |  |  |  |  |  |  |  |
Span Alaska | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Intangibles – Customer relationships | $ 79.3 |  |  |  |  |  |  |  |  |  |  |
Span Alaska | Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets less liabilities |  |  |  | $ 0.4 |  |  |  |  |  |  |  |
Horizon |  |  |  |  |  |  |  |  |  |  |  |
Total cash consideration |  |  |  |  |  |  |  |  |  |  |  |
Common shares |  | $ 29.4 |  |  |  |  |  |  |  |  |  | 29.4
Warrants |  | 37.1 |  |  |  |  |  |  |  |  |  |
Total debt assumed |  | 428.9 |  |  |  |  |  |  |  |  |  |
Total payments |  | 495.4 |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  | 0.8
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  | 31.7
Other current assets |  |  |  |  |  |  |  |  |  |  |  | 7.2
Deferred tax assets, net |  |  |  |  |  |  |  |  |  |  |  | 46.3
Property and equipment |  |  |  |  |  |  |  |  |  |  |  | 170.4
Intangibles – Customer relationships |  |  |  |  |  |  |  |  |  |  |  | 140.0
Other long-term assets |  |  |  |  |  |  |  |  |  |  |  | 4.1
Accounts payable |  |  |  |  |  |  |  |  |  |  |  | (22.8)
Accruals and other current liabilities |  |  |  |  |  |  |  |  |  |  |  | (31.4)
Multi-employer withdrawal liabilities |  |  |  |  |  |  |  |  |  |  |  | (65.5)
Capital lease obligations |  |  |  |  |  |  |  |  |  |  |  | (1.6)
Total identifiable assets less liabilities |  |  |  |  |  |  |  |  |  |  |  | (188.3)
Common shares |  | $ (29.4) |  |  |  |  |  |  |  |  |  | (29.4)
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 217.7
Horizon's debt and warrants |  |  |  |  |  |  |  |  |  |  |  | (467.5)
Condensed Consolidated Statements of Income and Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 277.6 |  |
Operating Income |  |  |  |  |  |  |  |  |  | 20.0 |  |
One-time acquisition related costs |  |  |  |  |  |  | $ 1.5 | $ 5.1 | $ 12.4 |  | $ 19.0 |
Estimated future benefit payments |  |  |  |  |  |  |  |  |  |  |  |
Quarterly payments to ILA-PRSSA over an estimated period |  |  | $ 1.0 |  |  |  |  |  |  | $ 1.0 |  |
Horizon | As previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Total cash consideration |  |  |  |  |  |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  | 29.4
Assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  | 0.8
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  | 31.7
Other current assets |  |  |  |  |  |  |  |  |  |  |  | 7.2
Deferred tax assets, net |  |  |  |  |  |  |  |  |  |  |  | 45.6
Property and equipment |  |  |  |  |  |  |  |  |  |  |  | 170.4
Intangibles – Customer relationships |  |  |  |  |  |  |  |  |  |  |  | 140.0
Other long-term assets |  |  |  |  |  |  |  |  |  |  |  | 4.1
Accounts payable |  |  |  |  |  |  |  |  |  |  |  | (22.8)
Accruals and other current liabilities |  |  |  |  |  |  |  |  |  |  |  | (32.1)
Multi-employer withdrawal liabilities |  |  |  |  |  |  |  |  |  |  |  | (60.6)
Capital lease obligations |  |  |  |  |  |  |  |  |  |  |  | (1.6)
Total identifiable assets less liabilities |  |  |  |  |  |  |  |  |  |  |  | (184.8)
Common shares |  |  |  |  |  |  |  |  |  |  |  | (29.4)
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 214.2
Horizon's debt and warrants |  |  |  |  |  |  |  |  |  |  |  | (467.5)
Horizon | Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets, net |  |  |  |  |  |  |  |  |  |  |  | 0.7
Accruals and other current liabilities |  |  |  |  |  |  |  |  |  |  |  | 0.7
Multi-employer withdrawal liabilities |  |  |  |  |  |  |  |  |  |  |  | (4.9)
Total identifiable assets less liabilities |  |  |  |  |  |  |  |  |  |  |  | (3.5)
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 3.5

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