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Quarterly report pursuant to Section 13 or 15(d)

Pensions And Other Postretirement Benefits (Components Of OPEB Expense) (Details)

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Pensions And Other Postretirement Benefits (Components Of OPEB Expense) (Details) (Other Benefits [Member], USD $)
In Millions
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Other Benefits [Member]
Ìý Ìý Ìý Ìý
Service cost $ 3.6 $ 2.2 $ 8.3 $ 5.4
Interest cost 5.5 5.4 16.7 16.1
Expected return on plan assets (4.1) (3.2) (12.1) (9.7)
Prior service costs 2.0 0.4 2.8 1.3
Net actuarial losses 0.8 3.1 6.6 6.5
Net periodic benefit cost 7.8 7.9 22.3 19.6
Quarterly OPEB contributions Ìý Ìý $ 21.9 $ 17.4