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Accumulated Other Comprehensive Income (Loss) by Component (Tables) | 12 Months Ended
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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 | )

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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=84228862&loc=SL7669686-108580 + Details
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