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Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2012
Postretirement Benefit Plans [Abstract] |
Net periodic benefit cost of pension plans and other employee related benefit plans |
|  | 2012 |  |  | 2011 |
Three Months Ended June 30 |  | Pension |  |  | Other Benefits |  |  | Total |  |  | Pension |  |  | Other Benefits |  |  | Total |
Net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1.6 |  |  | $ | 0.5 |  |  | $ | 2.1 |  |  | $ | 1.7 |  |  | $ | 0.5 |  |  | $ | 2.2 |
Interest cost |  |  | 4.1 |  |  |  | 2.2 |  |  |  | 6.3 |  |  |  | 4.0 |  |  |  | 2.3 |  |  |  | 6.3 |
Expected return on plan assets |  |  | (5.0 | ) |  |  | (0.2 | ) |  |  | (5.2 | ) |  |  | (4.7 | ) |  |  | (0.1 | ) |  |  | (4.8 | )
Amortization of prior service cost |  |  | 0.2 |  |  |  | — |  |  |  | 0.2 |  |  |  | 0.3 |  |  |  | — |  |  |  | 0.3 |
Amortization of net actuarial loss |  |  | 1.6 |  |  |  | 1.1 |  |  |  | 2.7 |  |  |  | 0.9 |  |  |  | 0.6 |  |  |  | 1.5 |
Net periodic benefit cost (income) |  | $ | 2.5 |  |  | $ | 3.6 |  |  | $ | 6.1 |  |  | $ | 2.2 |  |  | $ | 3.3 |  |  | $ | 5.5 |
|  | 2012 |  |  | 2011 |
Six Months Ended June 30 |  | Pension |  |  | Other Benefits |  |  | Total |  |  | Pension |  |  | Other Benefits |  |  | Total |
Net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 2.9 |  |  | $ | 1.1 |  |  | $ | 4.0 |  |  | $ | 3.3 |  |  | $ | 1.1 |  |  | $ | 4.4 |
Interest cost |  |  | 7.7 |  |  |  | 4.5 |  |  |  | 12.2 |  |  |  | 8.0 |  |  |  | 4.7 |  |  |  | 12.7 |
Expected return on plan assets |  |  | (9.1 | ) |  |  | (0.3 | ) |  |  | (9.4 | ) |  |  | (9.4 | ) |  |  | (0.3 | ) |  |  | (9.7 | )
Amortization of prior service cost (benefit) |  |  | 0.5 |  |  |  | (0.1 | ) |  |  | 0.4 |  |  |  | 0.6 |  |  |  | (0.1 | ) |  |  | 0.5 |
Amortization of net actuarial loss |  |  | 3.1 |  |  |  | 2.1 |  |  |  | 5.2 |  |  |  | 1.7 |  |  |  | 1.2 |  |  |  | 2.9 |
Net periodic benefit cost (income) |  | $ | 5.1 |  |  | $ | 7.3 |  |  | $ | 12.4 |  |  | $ | 4.2 |  |  | $ | 6.6 |  |  | $ | 10.8 |

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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + 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 (j) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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