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Accumulated Other Comprehensive Income (Loss) by Component (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2014 | $ | (63.4 | ) | (136.8 | ) | (200.2 | )
Other comprehensive income (loss) before reclassification | 24.3 |  | (163.7 | ) | (139.4 | )
Amounts reclassified from AOCI after tax expense of $0.8, $- and $0.8 | 3.3 |  | — |  | 3.3 |
Other comprehensive income (loss) after tax expense of $5.2, $- and $5.2 | 27.6 |  | (163.7 | ) | (136.1 | )
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 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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