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Warranties (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Changes in the accruals for warranties    
Beginning balance $ 13.5 $ 13.2
Warranty costs incurred (2.4) (1.3)
Warranty originations and revisions 3.8 1.6
Warranty expirations (0.4) (0.8)
Ending balance $ 14.5 $ 12.7