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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements of Comprehensive Income [Abstract] |  |  |
Recognition of deferred pension items, net of taxes | $ 1.0 | $ (1.8) | $ 3.6
Unrealized losses on derivative instruments, net of taxes | 0.7 | 0.4 | 0.5
Unrealized (losses) gains on available-for-sale securities, reclassified to net earnings |  | $ (2.6) | $ 2.6

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