Retirement and Other Postretirement Benefits (Details Textuals) (USD $) In Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Jun. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Retirement and Other Postretirement Benefits (Textuals) [Abstract]
Pension cost for non qualified pension plans	$ 4.9	$ 4.7		$ 14.6	$ 20.9
Expected 2011 pension contributions				400.5
Contributed pension plans				337.9
Remaining estimated pension contributions during period				62.6
Settlement charge related to the payment of lump sum benefits out of plan		$ 0.4	$ 7.3