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Quarterly financial information (unaudited) - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Pretax losses on debt extinguishment |  |  |  |  |  |  |  | $ 4.0 | $ 0.0 | $ 0.0
Restructuring charges | $ 13.1 | $ 31.9 | $ 10.2 | $ 26.9 | $ 48.5 | $ 17.4 | $ 52.6 | 82.1 | $ 118.5 |
6.25% senior notes due August 15, 2017 | Senior Notes |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Pretax losses on debt extinguishment |  |  |  |  |  |  |  | $ 4.0 |  |

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