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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Gross cost at January 1 |  |  | $ 294.6 | $ 295.8 |
Internally developed software |  |  | 1.1 | 0.8 |
Exchange effect |  |  | (2.1) | (1.6) |
Gross cost at September 30 | $ 293.6 | $ 295.0 | 293.6 | 295.0 |
Accumulated amortization at January 1 |  |  | (158.3) | (132.5) |
Amortization expense | (5.7) | (6.8) | (17.2) | (20.4) |
Exchange effect |  |  | 0.3 | 0.2 |
Accumulated amortization at September 30 | (175.2) | (152.7) | (175.2) | (152.7) |
Net book amount at September 30 | $ 118.4 | $ 142.3 | $ 118.4 | $ 142.3 | $ 136.3

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