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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.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Goodwill and Other Identifiable Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amortization and Impairment
Accumulated goodwill impairment losses	$ 200.5	$ 200.5	$ 200.5
Amortization		114.0us-gaap_AmortizationOfIntangibleAssets	134.1us-gaap_AmortizationOfIntangibleAssets	74.9us-gaap_AmortizationOfIntangibleAssets
Impairment charges, related to trade names	11.0	0	11.0	60.7
Water Quality Systems [Member]
Amortization and Impairment
Impairment charges, related to trade names				10.0
Technical Solutions
Amortization and Impairment
Impairment charges, related to trade names			11.0	11.6
Flow & Filtration Solutions [Member]
Amortization and Impairment
Impairment charges, related to trade names				$ 39.1