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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2012
Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive loss, net of tax, at December 31 were as follows:

($ in millions)
2012

2011

Foreign currency translation
$
17.2

$
10.2

Unrealized gains on securities of affiliates
0.8

0.4

Unrealized losses on derivatives
(9.0
)
(5.4
)
Defined benefit pension and other postretirement plans
(84.9
)
(76.7
)
 
$
(75.9
)
$
(71.5
)