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Financial Statement Details - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Disclosure of Financial Statement Details [Abstract]
Accounts payable trade	$ 59.9		$ 46.7
Accrued tax, audit, and legal fees	15.4		7.1
Accrued rebates	19.9		13.9
Accrued warranty	7.5	$ 8.9	8.8	$ 8.3	$ 9.9	$ 9.8
Accrued other	15.2		10.7
Total	$ 117.9		$ 87.2

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Carrying value as of the balance sheet date of accrued current tax, audit and legal fees.

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Pharmacy Rebates

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Amount of liabilities incurred to vendors for goods and services received, and accrued liabilities classified as other, payable within one year or the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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-Name Accounting Standards Codification
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