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Financial Statement Details - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable trade	$ 57.7		$ 46.7
Accrued tax, audit, and legal fees	18.3		7.1
Accrued rebates	34.7		13.9
Accrued warranty	6.4	$ 7.5	8.8	$ 8.7	$ 8.3	$ 9.8
Accrued other	18.3		10.7
Total	$ 135.4		$ 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e7018-107765

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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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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 8
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