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Auditor's Remuneration Paid to Ernst & Young LLP - Summary of Auditor's Remuneration Paid (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Auditor's remuneration [abstract]      
Audit of the Financial Statements $ 3.3 $ 3.0 $ 2.4
Audit of subsidiaries 2.9 2.2 2.2
Audit-related assurance services 0.2 0.2 0.2
Other assurance services 1.3 1.0 1.2
Tax compliance 0.0 0.1 0.4
Tax advisory 0.0   0.1
Other non-audit services not covered by the above 0.1 0.2 0.1
Total expense related to remuneration $ 7.8 $ 6.7 $ 6.6