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Commitments and contingencies (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2011 insurer | May 31, 2009 defendant | Dec. 31, 2016 USD ($) defendant case | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Rent expense |  |  | $ 18,600,000 | $ 20,900,000 | $ 20,800,000 |  |
Amount of letters of credit |  |  | $ 17,000,000 |  |  |  |
Asbestos Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of defendants | defendant |  |  | 1 |  |  |  |
Portland Harbor Superfund Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of defendants | defendant |  | 1 |  |  |  |  |
Asbestos Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Annual out-of-pocket costs (less than) |  |  | $ 200,000 | $ 200,000 | $ 200,000 | $ 200,000 | $ 200,000
New claims filed each year (fewer than) | case |  |  | 100 |  |  |  |
Pending lawsuits (fewer than) | case |  |  | 200 |  |  |  |
Face amount of insurance coverage per occurrence (over) |  |  | $ 17,000,000 |  |  |  |
Aggregate primary insurance coverage (over) |  |  | 23,000,000 |  |  |  |
Face amount of excess coverage (over) |  |  | $ 950,000,000 |  |  |  |
Number of primary insurers under settlement agreement | insurer | 7 |  |  |  |  |  |
Percentage of costs of handling and settling each claim covered by insurance | 80.00% |  |  |  |  |  |

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