Pensions and Postretirement Benefits (Details 15) (Other Postretirement Benefit Plans Defined Benefit [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Other Postretirement Benefit Plans Defined Benefit [Member]
Expected postretirement benefit payments other than pensions
Defined benefit plan, Expected future benefit payments in 2012	$ 32.0
Defined benefit plan, Expected future benefit payments in 2013	32.1
Defined benefit plan, Expected future benefit payments in 2014	32.0
Defined benefit plan, Expected future benefit payments in 2015	31.7
Defined benefit plan, Expected future benefit payments in 2016	31.2
Defined benefit plan, Expected future benefit payments in five fiscal years 2017 - 2021	144.5
Prescription drug subsidy receipts, 2012	(3.6)
Prescription drug subsidy receipts, 2013	(3.8)
Prescription drug subsidy receipts, 2014	(3.9)
Prescription drug subsidy receipts, 2015	(4.0)
Prescription drug subsidy receipts, 2016	(4.1)
Prescription drug subsidy receipts, five fiscal years 2017 - 2021	22.0
Defined benefit plan net payment in 2012	28.4
Defined benefit plan net payment in 2013	28.3
Defined benefit plan net payment in 2014	28.1
Defined benefit plan net payment in 2015	27.7
Defined benefit plan net payment in 2016	27.1
Defined benefit plan net payment in five fiscal years 2017 - 2021	$ 122.5