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Accumulated Other Comprehensive Income (Loss) by Component (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2016 | $ | (68.7 | ) | (482.6 | ) | (551.3 | )
Other comprehensive loss before reclassification | 4.4 |  | 202.0 |  | 206.4 |
Amounts reclassified from AOCI after tax expense of $0.9, $- and $0.9 | 3.8 |  | — |  | 3.8 |
Other comprehensive loss after tax benefit of $0.3, $- and $0.3 | 8.2 |  | 202.0 |  | 210.2 |
Balance as of December 31, 2017 | (60.5 | ) | (280.6 | ) | (341.1 | )
Other comprehensive income before reclassification | 0.7 |  | (118.2 | ) | (117.5 | )
Amounts reclassified from AOCI after tax expense of $0.6, $- and $0.6 | 2.4 |  | — |  | 2.4 |
Other comprehensive income after tax expense of $0.3, $- and $0.3 | 3.1 |  | (118.2 | ) | (115.1 | )
Balance as of December 31, 2018 | $ | (57.4 | ) | (398.8 | ) | (456.2 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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