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Consolidated Statements of Comprehensive Income/(Loss) (Parenthetical) (Unaudited) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Consolidated Statements of Comprehensive Income/(Loss) [Abstract] |  |  |  |
Changes in unrealized gains/(losses) on derivative instruments, tax | $ 0 | $ 0.4 | $ 0.1 | $ 0.4
Amortization of prior service credit, tax | 0 | 0.1 | 0.2 | 0.3
Amortization of actuarial net losses, tax | $ 0 | $ 0 | $ (0.2) | $ (0.1)

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