Pension and Other Post-Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2011

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Contributions to Multiemployer Benefit Plans

Multiemployer Plans	EIN and Pension Plan Number		Pension Protection Act Zone Status		GATX Contributions									Collective Bargaining Agreement Expiration Date(b)
					2011			2010			2009
American Maritime Officers Pension Plan		13-1969709-001		Critical-Red	$	2.1	(a)	$	2.2	(a)	$	1.5	(a)		January15, 2017
Other multiemployer post-retirement plans						6.4			6.2			3.7
Total					$	8.5		$	8.4		$	5.2

(a) Represents more than 5% of the total contributions to the plan during each year and no surcharge has been imposed for any year.

(b) ASC completed negotiations for a new collective bargaining agreement in January, 2012. The previous collective bargaining agreement expired in August, 2011.

Forth pension obligations and plan assets and other post-retirement obligations

	2011 Pension Benefits			2010 Pension Benefits			2011 Retiree Health and Life			2010 Retiree Health and Life
Change in Benefit Obligation
Benefit obligation at beginning of year	$	413.2		$	402.9		$	46.6		$	48.5
Service cost		5.4			5.3			0.2			0.2
Interest cost		20.7			22.1			2.2			2.4
Plan amendments		—			(0.2	)		—			—
Actuarial loss (gain)		13.5			16.0			—			(0.1	)
Benefits paid		(27.5	)		(31.7	)		(4.2	)		(4.4	)
Effect of foreign exchange rate changes		(0.3	)		(1.2	)		—			—
Benefit obligation at end of year	$	425.0		$	413.2		$	44.8		$	46.6
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$	392.7		$	354.4		$	—		$	—
Actual return on plan assets		10.2			52.9			—			—
Effect of exchange rate changes		(0.1	)		(1.2	)		—			—
Company contributions		2.2			18.3			4.2			4.4
Benefits paid		(27.5	)		(31.7	)		(4.2	)		(4.4	)
Plan assets at end of year	$	377.5		$	392.7		$	—		$	—
Funded Status at end of year	$	(47.5	)	$	(20.5	)	$	(44.8	)	$	(46.6	)
Amount Recognized
Other liabilities	$	(47.5	)	$	(20.5	)	$	(44.8	)	$	(46.6	)
Accumulative other comprehensive loss:
Net actuarial loss		193.5			164.4			1.8			1.6
Prior service credit		(5.1	)		(6.1	)		—			—
Accumulated other comprehensive loss		188.4			158.3			1.8			1.6
Total recognized	$	140.9		$	137.8		$	(43.0	)	$	(45.0	)
After-tax amount recognized in accumulated other comprehensive loss	$	117.6		$	98.9		$	1.1		$	1.0

Pension plans with a projected benefit obligation in excess of plan assets

	2011		2010
Projected benefit obligations	$	425.0	$	60.2
Fair value of plan assets		377.5		34.4

Pension plans with an accumulated benefit obligation in excess of plan assets

	2011		2010
Accumulated benefit obligations	$	408.9	$	54.6
Fair value of plan assets		377.5		34.4

Components of pension and other post retirement benefit costs

	2011 Pension Benefits			2010 Pension Benefits			2009 Pension Benefits			2011 Retiree Health and Life			2010 Retiree Health and Life			2009 Retiree Health and Life
Service cost	$	5.4		$	5.3		$	4.8		$	0.2		$	0.2		$	0.2
Interest cost		20.7			22.1			23.7			2.2			2.4			2.9
Expected return on plan assets		(33.2	)		(33.5	)		(31.2	)		—			—			—
Amortization of:
Unrecognized prior service credit		(1.0	)		(1.0	)		(1.0	)		(0.1	)		(0.1	)		(0.1	)
Unrecognized net actuarial loss (gain)		7.2			6.0			2.7			(0.3	)		(0.3	)		(0.4	)
Net periodic (benefit) cost	$	(0.9	)	$	(1.1	)	$	(1.0	)	$	2.0		$	2.2		$	2.6

Expected long term return on assets and to measure the periodic cost

	2011			2010
Domestic defined benefit pension plans
Benefit Obligation at December 31:
Discount rate — salaried funded and unfunded plans		4.80	%		5.25	%
Discount rate — hourly funded plans		4.85	%		5.25	%
Rate of compensation increases — salaried funded and unfunded plan		3.00	%		4.50	%
Rate of compensation increases — hourly funded plan		N/A			N/A
Net Periodic Cost (Benefit) for the years ended December 31:
Discount rate — salaried funded and unfunded plans		5.25	%		5.70	%
Discount rate — hourly funded plans		5.25	%		5.70	%
Expected return on plan assets — salaried funded plan		8.65	%		8.75	%
Expected return on plan assets — hourly funded plan		7.80	%		7.90	%
Rate of compensation increases — salaried funded and unfunded plan		4.50	%		4.50	%
Rate of compensation increases — hourly funded plan		N/A			N/A
Foreign defined benefit pension plan
Benefit Obligation at December 31:
Discount rate		4.65	%		5.40	%
Rate of pension-in-payment increases		2.90	%		3.40	%
Net Periodic Cost (Benefit) for the years ended December 31:
Discount rate		5.40	%		5.70	%
Expected return on plan assets		6.12	%		6.56	%
Rate of pension-in-payment increases		3.40	%		3.50	%
Other post-retirement benefit plans
Benefit Obligation at December 31:
Discount rate — salaried Health		4.50	%		4.95	%
Discount rate — hourly Health		4.60	%		4.95	%
Rate of compensation increases		N/A			N/A
Discount rate — salaried Life Insurance		4.75	%		4.95	%
Discount rate — hourly Life Insurance		4.45	%		4.95	%
Rate of compensation increases		N/A			N/A
Net Periodic Cost (Benefit) for the years ended December 31:
Discount rate		4.95	%		5.45	%
Rate of compensation increases		N/A			N/A

Review of historical returns

	2011			2010
Assumed Health Care Cost Trend Rates at December 31
Health care cost trend assumed for next year
Medical claims		7.50	%		8.00	%
Prescription drugs claims		7.50	%		8.50	%
Rate to which the cost trend is expected to decline (the ultimate trend rate)
Medical claims		5.00	%		5.00	%
Prescription drugs claims		5.00	%		5.00	%
Year that rate reaches the ultimate trend rate
Medical claims		2018			2018
Prescription drugs claims		2018			2018

Effect on the other post-retirement benefit cost and obligation

	One-Percentage-Point Increase		One-Percentage-Point Decrease
Effect on total of service and interest cost	$	0.1	$	(0.1	)
Effect on post-retirement benefit obligation		2.2		(1.9	)

Pension plan assets fair value

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total December 31, 2011
Assets
Short-term investment funds	$	4.3	$	—	$	—	$	4.3
Common stock		8.9		—		—		8.9
Common stock collective funds		—		222.5		—		222.5
Fixed income collective trust funds		—		125.3		—		125.3
Real estate investment funds		—		—		17.9		17.9

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total December 31, 2010
Assets
Short-term investment funds	$	4.0	$	—	$	—	$	4.0
Common stock		10.7		—		—		10.7
Common stock collective funds		—		243.8		—		243.8
Fixed income collective trust funds		—		120.3		—		120.3
Real estate investment funds		—		—		13.9		13.9

Summary of changes in the fair value of the Plan's Level 3 assets

	2011		2010
Beginning balance	$	13.9	$	12.7
Income		0.6		0.8
Realized losses		—		(0.7	)
Unrealized change in fair value of investments		1.5		1.1
Purchases		1.9		—
Ending balance	$	17.9	$	13.9

Schedule of Expected Benefit Payments

	Qualified Plans		Nonqualified Plans		Other Benefits
2012	$	26.0	$	4.3	$	4.5
2013		25.6		4.3		4.3
2014		25.7		4.4		4.2
2015		26.1		4.4		4.0
2016		26.4		4.7		3.8
Years 2017-2021		133.1		25.7		15.5
	$	262.9	$	47.8	$	36.3

Expected Subsidies To Be Received

2012	$	0.6
2013		0.6
2014		0.6
2015		0.6
2016		0.5
Years 2017-2021		2.8
	$	5.7

Foreign Funded Pension Plans, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Weighted-average asset allocations of domestic funded pension plans

				Plan Assets at December 31
	Target			2011			2010
Asset Category
Equity securities		36.8	%		36.1	%		37.1	%
Debt securities		63.2	%		63.9	%		62.9	%
		100.0	%		100.0	%		100.0	%

Domestic defined benefit pension plans [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Weighted-average asset allocations of domestic funded pension plans

				Plan Assets at December 31
	Target			2011			2010
Asset Category
Equity securities		65.8	%		64.1	%		67.6	%
Debt securities		29.2	%		30.1	%		27.6	%
Real estate		5.0	%		5.2	%		3.9	%
Cash		—			0.6	%		0.9	%
		100.0	%		100.0	%		100.0	%