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Condensed Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Condensed Consolidated Statements of Comprehensive (Loss) Income [Abstract] |  |  |  |
Tax on recognition of deferred pension items | $ 0.6 | $ 0.4 | $ 2.1 | $ 0.7
Tax on unrealized losses on derivative instruments |  | $ 0.1 | $ 0.1 | $ 0.2

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