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Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	2 Months Ended	3 Months Ended	1 Months Ended
	Mar. 31, 2011 Successor Company	Mar. 31, 2012 Successor Company	Jan. 24, 2011 Predecessor Company
Tax expenses on defined benefit pension and post retirement plans	$ 0	$ 0.5	$ 0.5

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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