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Commitments and Contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Environmental Remediation Obligations [Abstract]
Balance at the beginning of the year	$ 118.5
Additions charged to expense, net	0.1
Payments, net	(0.5)
Balance at the end of period	118.1
Amounts recognized in our Condensed Consolidated Balance Sheet at the end of the period:
Current liabilities	10.1	10.2
Noncurrent liabilities	108.0	108.3
Total	$ 118.1

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

+ References+ Details