Pension Plans and Other Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																		12 Months Ended	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Pension Plans	Dec. 31, 2011 Pension Plans	Mar. 31, 2012 Pension Plans Underfunded and Unfunded pension plans	Dec. 31, 2011 Pension Plans Underfunded and Unfunded pension plans	Mar. 31, 2012 Pension Plans Underfunded pension plans	Dec. 31, 2011 Pension Plans Underfunded pension plans	Mar. 31, 2012 Pension Plans Unfunded pension plans	Dec. 31, 2011 Pension Plans Unfunded pension plans	Mar. 31, 2012 U.S. qualified pension plans	Dec. 31, 2011 U.S. qualified pension plans	Dec. 31, 2011 Non-U.S. pension plans	Dec. 31, 2011 Non-U.S. pension plans United Kingdom	Mar. 31, 2012 Non-U.S. pension plans Germany	Dec. 31, 2011 Non-U.S. pension plans Germany	Mar. 31, 2012 Non-U.S. pension plans Canada	Dec. 31, 2011 Non-U.S. pension plans Canada	Dec. 31, 2011 Non-U.S. pension plans United Kingdom, Germany and Canada	Mar. 31, 2012 Postretirement Benefits Other Than Pensions year
Funded status of fully funded, underfunded, and unfunded pension plans:
Overfunded defined benefit pension plans	$ 33.3	$ 37.1	$ 33.3	$ 37.1
Total underfunded and unfunded defined benefit pension plans	(293.5)	(407.4)			(293.5)	(407.4)	(90.3)	(228.0)	(203.2)	(179.4)
Unfunded defined benefit pension plans included in liabilities subject to compromise	(184.3)	(185.2)	(123.7)	(123.3)
Pension liabilities included in other current liabilities			(13.7)	(13.2)
Net funded status			(397.6)	(506.8)
Combined balance of the underfunded and unfunded plans			430.9
Defined benefit pension plans, projected obligation				1,757.0
Defined benefit pension plans, discount rate (as a percent)											4.50%	4.50%	4.83%	4.75%	3.75%	4.50%	4.75%	5.25%
Pension benefit obligation (as a percent)																			90.00%
Increase (Decrease) in total plan liabilities	22
Postretirement Benefits Other Than Pensions
Minimum eligible age for medical plan benefits (in years)																				55
Minimum required contribution by retirees and beneficiaries, as percentage of the calculated premium																				40.00%
Percentage contribution by retirees for any increase in premium costs																				100.00%
Initially assumed increase in per capita costs (as a percent)																				9.50%
Ultimate health care cost rate (as a percent)																				5.00%
Maximum impact of one percentage point increase (decrease) in assumed health care medical cost trend rate on postretirement benefit obligations																				$ 1