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Warranties (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Changes in the accruals for warranties    
Beginning balance $ 14.7 $ 12.5
Warranty costs incurred (0.8) (1.5)
Warranty originations and revisions 2.3 2.6
Warranty expirations (1.0) (1.0)
Ending balance $ 15.2 $ 12.6