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Stockholders' equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance | $ 851.3 | $ 818.3 | $ 839.8 | $ 754.3 |
Balance as adjusted |  |  |  | 754.3 |
Ending Balance | 868.0 | 853.6 | 868.0 | 853.6 |
Currency Translation |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance | (245.1) | (201.2) | (245.0) | (211.9) |
Other comprehensive income (loss) | 7.1 | (25.2) | 7.0 | (14.5) |
Ending Balance | (238.0) | (226.4) | (238.0) | (226.4) |
Marketable Securities |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance |  |  |  | 4.8 |
Change in accounting principle |  | (4.8) |  | (4.8) |
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance | (177.7) | (170.4) | (180.0) | (172.8) |
Other comprehensive income (loss) | 2.2 | 2.5 | 4.5 | 4.9 |
Ending Balance | (175.5) | (167.9) | (175.5) | (167.9) |
Accumulated Defined Benefit Plans Adjustment | OPEB Plans |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance | 0.6 | 1.1 | 0.7 | 1.2 |
Other comprehensive income (loss) |  | (0.1) | (0.1) | (0.2) |
Ending Balance | 0.6 | 1.0 | 0.6 | 1.0 |
Total Accumulated Other Comprehensive Loss |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance | (422.2) | (370.5) | (424.3) | (378.7) |
Change in accounting principle |  | (4.8) |  | (4.8) | $ (4.8)
Balance as adjusted | (422.2) | (370.5) | (424.3) | (383.5) |
Other comprehensive income (loss) | 9.3 | (22.8) | 11.4 | (9.8) |
Ending Balance | $ (412.9) | $ (393.3) | $ (412.9) | $ (393.3) |

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