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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Continuing Operations [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	$ 48.9	$ 42.8	$ 98.6	$ 105.0
Discontinued Operations [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets	$ 9.5	36.6	$ 41.5	76.1
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Expense (income) adjustment for amortization		$ (2.8)		$ 13.6

X

- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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