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Capital Disclosures (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Feb. 28, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about borrowings [line items] |  |  |  |
Available borrowings | $ 73,500,000 |  | $ 70,000,000 |
Former Revolving Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  | $ 300,000,000
Revolving Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Line of credit, maximum borrowing capacity | 300,000,000 |  |  |
Amount of accordion feature | 150,000,000.0 |  |  |
Borrowings | 0 |  | 15,000,000 |
Available borrowings | 276,800,000 |  |  |
Credit Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 187,500,000 |  | 227,500,000 |
Letters of credit outstanding | 23,200,000 |  | 25,800,000 |
Bridge Loan | Revolving Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Line of credit, maximum borrowing capacity | $ 25,000,000.0 |  |  |
Bridge Loan | Revolving Facility | Top of range |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debt instrument term | 7 days |  |  |
Factoring of receivables from facility program |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Agreement to sell trade receivables, maximum capacity | $ 200,000,000 | $ 250,000,000.0 |  |
Accounts receivable sold during period | $ 80,000,000 |  | 50,000,000 |
Term of agreement extensions | 1 year |  |  |
Factoring of receivables from supplier financing program |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Accounts receivable sold during period | $ 52,300,000 |  | $ 51,400,000 |

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