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Supplemental Disclosures (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Financial Information [Line Items]
Effective tax rate	44.50%	25.50%	36.10%	45.50%	43.00%	32.00%	26.00%
Reduction to income tax expense due to settlements	$ 13.4			$ 61.0
Income tax refunds			$ 1.4	$ 4.1

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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