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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Gross cost at January 1 |  |  | $ 294.6 | $ 295.8 |
Internally developed software |  |  | 0.7 | 0.8 |
Exchange effect |  |  | (0.3) | (1.4) |
Gross cost at June 30 | $ 295.0 | $ 295.2 | 295.0 | 295.2 |
Accumulated amortization at January 1 |  |  | (158.3) | (132.5) |
Amortization expense | (5.8) | (6.9) | (11.5) | (13.6) |
Exchange effect |  |  | (0.1) | 0.3 |
Accumulated amortization at June 30 | (169.9) | (145.8) | (169.9) | (145.8) |
Net book amount at June 30 | $ 125.1 | $ 149.4 | $ 125.1 | $ 149.4 | $ 136.3

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