Pension and Savings Plans (Details 1) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Plans, Defined Benefit [Member]
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss arising during year	$ 144.2	$ 13.1	$ 46.1
Amortizations:
Actuarial gain (loss)	(30.1)	(21.9)	(1.9)
Prior service cost	(1.0)	(1.4)	(1.4)
Total recognized in other comprehensive loss	113.1	(10.2)	42.8
Net periodic pension (benefit) cost	18.2	17.0	(4.9)
Total recognized in net periodic benefit cost and other comprehensive loss	$ 131.3	$ 6.8	$ 37.9