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Leases And Commitments (Tables)
 12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Warranty Accrual
The following is a rollforward of the Company’s accrued warranty liability for the years ended December 31, 2012 and 2011 ($ in millions):
 
Balance, January 1, 2011
$
127.7

Accruals for warranties issued during the period
115.2

Settlements made
(125.4
)
Additions due to acquisitions
21.3

Effect of foreign currency translation
(1.9
)
Balance, December 31, 2011
136.9

Accruals for warranties issued during the period
134.0

Settlements made
(134.9
)
Additions due to acquisitions
4.1

Effect of foreign currency translation
0.6

Balance, December 31, 2012
$
140.7