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Income Taxes - Roll-forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2018	Jun. 30, 2019
Income Tax Contingency [Line Items]
Opening balance at January 1		$ 14.0
Additions for tax positions of prior periods		0.6
Closing balance at June 30	$ 14.0	14.6
Current		0.0
Non-current	14.0	14.6
Unrecognized Tax Benefits [Member]
Income Tax Contingency [Line Items]
Opening balance at January 1		13.4
Additions for tax positions of prior periods		0.0
Closing balance at June 30	13.4	13.4
Current		0.0
Non-current		13.4
Interest and Penalties [Member]
Income Tax Contingency [Line Items]
Opening balance at January 1		0.6
Additions for tax positions of prior periods		0.6
Closing balance at June 30	$ 0.6	1.2
Current		0.0
Non-current		$ 1.2

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Amount recognized for uncertainty in income taxes classified as current.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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