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Revenue Recognition - Disaggregation of Net Sales by Place of Manufacture and to Location of Customer (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | $ 484.5 | $ 471.8 | $ 921.0 | $ 902.2
Point of origin | Reportable Geographical Components | Germany |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | 248.5 | 257.7 | 467.7 | 492.2
Point of origin | Reportable Geographical Components | United States |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | 289.3 | 208.9 | 534.6 | 405.7
Point of origin | Reportable Geographical Components | Canada |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | 95.9 | 82.2 | 174.4 | 153.8
Point of origin | Reportable Geographical Components | Belgium |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | 77.7 | 68.9 | 147.4 | 138.6
Point of origin | Reportable Geographical Components | Norway |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | 47.7 | 56.5 | 99.2 | 109.6
Point of origin | Eliminations |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | (274.6) | (202.4) | (502.3) | (397.7)
Point of destination | Europe |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | 229.4 | 238.5 | 444.6 | 472.4
Point of destination | North America |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | 161.5 | 143.6 | 308.3 | 270.6
Point of destination | Other |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |
Net sales | $ 93.6 | $ 89.7 | $ 168.1 | $ 159.2

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