Retirement and Other Postretirement Benefits (Details Textuals) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Retirement and Other Postretirement Benefits (Textuals) [Abstract]
Pension cost for non qualified pension plans	$ 4.9	$ 11.5	$ 9.8	$ 16.1
Expected 2011 pension contributions			400.5
Contributed pension plans			275.1
Remaining estimated pension contributions during period			125.4
Settlement charge related to the payment of lump sum benefits out of plan		$ 6.9