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Recent accounting pronouncements and accounting changes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment | $ 4.4 |  |  |  |
Reclassification from operating activities, Other assets | 27.5 | $ (16.5) | [1] | $ (18.1) | [1]
Reclassification to investing activities, Other | (0.8) | (0.9) | [1] | 7.0 | [1]
Reclassification from operating activities, Accounts payable and other accrued liabilities | 48.6 | 7.5 | [1] | (60.3) | [1]
Reclassification to financing activities, Other | 2.3 | 0.4 | [1] | 0.8 | [1]
Accounting Standards Update 2016-15 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification from operating activities, Other assets |  | 1.5 |  | 1.1 |
Reclassification to investing activities, Other |  | 1.5 |  | 1.1 |
Accounting Standards Update 2016-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification from operating activities, Accounts payable and other accrued liabilities |  | 0.4 |  | 0.8 |
Reclassification to financing activities, Other |  | 0.4 |  | $ 0.8 |
Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net periodic benefit cost, other than service cost | 92.5 | 81.6 |  |  |
Accumulated Deficit |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment | $ 4.4 |  |  |  |
Accumulated Deficit | Accounting Standards Update 2016-16 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment |  | $ 4.4 |  |  |
[1] | Amounts were changed to conform to the current-year presentation. See Note 5

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