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Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2012
Postretirement Benefits [Abstract] |
Net periodic pension expense for defined benefit pension plans |
|  | U.S. Benefit Plan |  |  | Non-U.S. Benefit Plan |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |  |  | Three months ended September 30, |  |  | Nine months ended September 30, |
($ in millions) |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | 0.1 |
Interest cost |  |  | 1.5 |  |  |  | 1.8 |  |  |  | 5.5 |  |  |  | 5.5 |  |  |  | 0.7 |  |  |  | 0.8 |  |  |  | 2.0 |  |  |  | 2.2 |
Expected return on plan assets |  |  | (1.6 | ) |  |  | (1.7 | ) |  |  | (6.0 | ) |  |  | (5.3 | ) |  |  | (0.7 | ) |  |  | (0.8 | ) |  |  | (2.0 | ) |  |  | (2.5 | )
Amortization of actuarial loss |  |  | 1.3 |  |  |  | 1.1 |  |  |  | 4.1 |  |  |  | 3.3 |  |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.6 |  |  |  | 0.7 |
Net pension expense |  | $ | 1.2 |  |  | $ | 1.2 |  |  | $ | 3.6 |  |  | $ | 3.5 |  |  | $ | 0.3 |  |  | $ | 0.2 |  |  | $ | 0.8 |  |  | $ | 0.5 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4, 7, 16, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=21916443&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2410-114920 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2439-114920 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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