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Pension Plans (Tables) | 9 Months Ended
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Sep. 30, 2012
Pension Plans [Abstract] |
Defined benefit pension plan |
|  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
(in millions) |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Plan net pension credit/(charge): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | (0.4 | ) |  | $ | (0.4 | ) |  | $ | (1.2 | ) |  | $ | (1.2 | )
Interest cost on projected benefit obligation |  |  | (8.0 | ) |  |  | (9.2 | ) |  |  | (24.0 | ) |  |  | (27.5 | )
Expected return on plan assets |  |  | 8.4 |  |  |  | 9.3 |  |  |  | 25.4 |  |  |  | 27.7 |
Amortization of prior service credit |  |  | 0.3 |  |  |  | 0.3 |  |  |  | 0.9 |  |  |  | 1.0 |
Amortization of actuarial net losses |  |  | (0.3 | ) |  |  | (0.1 | ) |  |  | (0.9 | ) |  |  | (0.3 | )
|  | $ | 0.0 |  |  | $ | (0.1 | ) |  | $ | 0.2 |  |  | $ | (0.3 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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