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Accumulated Other Comprehensive Income (Loss) by Component (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The table below presents the changes in Accumulated other comprehensive income (loss) by component.
($ in millions)
Pension and postretirement benefit
Cumulative foreign currency translation adjustment
Total
Balance as of December 31, 2015
$
(35.8
)
(300.5
)
(336.3
)
Other comprehensive loss before reclassification
(33.6
)
(181.9
)
(215.5
)
Amounts reclassified from AOCI after tax expense of $0.2, $- and $0.2
0.7

—

0.7

Other comprehensive loss after tax benefit of $10.4, $- and $10.4
(32.9
)
(181.9
)
(214.8
)
Balance as of December 31, 2016
(68.7
)
(482.4
)
(551.1
)
Other comprehensive income before reclassification
4.4

201.1

205.5

Amounts reclassified from AOCI after tax expense of $0.9, $- and $0.9
3.8

—

3.8

Other comprehensive income after tax benefit of $0.3, $- and $0.3
8.2

201.1

209.3

Balance as of December 31, 2017
$
(60.5
)
(281.3
)
(341.8
)