Quarterly report pursuant to Section 13 or 15(d)

Pensions and Other Postretirement Benefits (Components of Defined Benefit Pension) (Details)

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Pensions and Other Postretirement Benefits (Components of Defined Benefit Pension) (Details) (Pension Benefits [Member], USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Pension Benefits [Member]
       
Service cost $ 5.2 $ 4.6 $ 11.0 $ 9.0
Interest cost 12.2 13.1 25.8 25.6
Expected return on plan assets (13.7) (13.5) (29.2) (26.1)
Prior service costs 1.0 1.0 2.2 2.1
Net actuarial loss 4.8 6.0 10.0 11.9
Net periodic benefit cost 9.5 11.2 19.8 22.5
Quarterly pension contributions     $ 27.3 $ 11.7