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Recent accounting pronouncements and accounting changes - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Decrease in other long-term assets | $ (181.5) | $ (194.3) | [1]
Decrease in other accrued liabilities | (349.2) | (329.9) | [1]
Decrease in other long-term liabilities | $ (83.2) | (79.2) | [1]
Accounting Standards Update 2015-03 | Other long-term assets |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs, amount reclassified |  | (1.8) |
Accounting Standards Update 2015-03 | Long-term debt |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs, amount reclassified |  | 1.8 |
Accounting Standards Update 2015-17 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reduction of deferred income taxes, current |  | 24.1 |
Decrease in other current assets |  | 0.1 |
Increase in deferred income taxes, non current |  | 12.9 |
Decrease in other long-term assets |  | 0.1 |
Decrease in other accrued liabilities |  | 9.4 |
Decrease in other long-term liabilities |  | $ 2.0 |
[1] | Changed to conform to the current-year presentation. See Note 5.

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