Number of customers.

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Significant accounting policies.

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Customer	Jun. 30, 2017 USD ($)
Significant Accounting Policies [Line Items]
Deferred installation costs	$ 1.6		$ 3.2
Selling, general and administrative expenses	290.9	$ 574.0	595.3	$ 828.2
ASC 606
Significant Accounting Policies [Line Items]
Net increase to retained earnings	13.0		13.0
ASC 606 \| Difference between Revenue Guidance in Effect before and after Topic 606
Significant Accounting Policies [Line Items]
Capitalization of contract acquisition costs	22.9		22.9
Deferred installation costs			4.9
Deferred income taxes liabilities	5.0		5.0
Selling, general and administrative expenses	$ 2.7		$ 6.3
Minimum
Significant Accounting Policies [Line Items]
Number of customers \| Customer			1,000,000