Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Defined Benefit Plan Disclosure [Line Items]

Weighted-average assumptions used to determine Benefit Obligations and Net Periodic Benefit Cost for the U.S.-based plans

	Pension Benefits
	2011			2010
Weighted-average assumptions used to determine benefit obligations as of December 31:
Discount rate		4.93	%		5.43	%
Rate of compensation increase		3.68			3.94

	Pension Benefits
	2011			2010			2009
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate		5.43	%		5.98	%		6.57	%
Expected long-term return on plan assets		5.56			5.59			6.24
Rate of compensation increase		3.98			3.98			3.90

Defined Contribution Plans

	For the Years  Ended December 31,
	2011		2010		2009
Contributions to defined contribution plans	$	14.3	$	12.1	$	12.4

Pension and Postretirement Benefit Plans recognized in financial statements

	Pension Benefits						Other Benefits
	2011			2010			2011			2010
Accumulated benefit obligation	$	363.6		$	333.2		$	N/A		$	N/A
Changes in projected benefit obligation:
Benefit obligation at beginning of year	$	336.3		$	299.4		$	17.0		$	14.4
Service cost		5.4			5.0			0.8			0.6
Interest cost		17.8			17.6			0.9			0.8
Plan participants’ contributions		—			—			0.8			0.8
Amendments		—			—			—			(0.1	)
Actuarial loss		28.9			34.0			2.3			2.4
Effect of exchange rates		(0.7	)		0.4			—			—
Settlements and curtailments		(2.1	)		(2.6	)		—			—
Benefits paid		(16.8	)		(17.5	)		(1.9	)		(1.9	)
Benefit obligation at end of year	$	368.8		$	336.3		$	19.9		$	17.0
Changes in plan assets:
Fair value of plan assets at beginning of year	$	244.6		$	231.1		$	—		$	—
Actual gain return on plan assets		3.8			27.6			—			—
Employer contribution		13.4			5.6			1.1			1.1
Plan participants’ contributions		—			—			0.8			0.8
Effect of exchange rates		(0.4	)		0.4			—			—
Plan settlements		(2.1	)		(2.6	)		—			—
Benefits paid		(16.8	)		(17.5	)		(1.9	)		(1.9	)
Fair value of plan assets at end of year		242.5			244.6			—			—
Funded status/net amount recognized	$	(126.3	)	$	(91.7	)	$	(19.9	)	$	(17.0	)
Net amount recognized consists of:
Current liability	$	(1.6	)	$	(3.6	)	$	(1.3	)	$	(1.1	)
Non-current liability		(124.7	)		(88.1	)		(18.6	)		(15.9	)
Net amount recognized	$	(126.3	)	$	(91.7	)	$	(19.9	)	$	(17.0	)

Schedule of Non-current pension liability plan

	For the Years  Ended December 31,
	2011		2010
Pension plans with a benefit obligation in excess of plan assets:
Projected benefit obligation	$	368.1	$	335.6
Accumulated benefit obligation		362.9		332.5
Fair value of plan assets		241.8		243.8

Components of net periodic benefit cost

	Pension Benefits									Other Benefits
	2011			2010			2009			2011			2010			2009
Components of net periodic benefit cost as of December 31:
Service cost	$	5.4		$	5.0		$	5.6		$	0.8		$	0.6		$	0.5
Interest cost		17.8			17.6			17.5			0.9			0.8			0.8
Expected return on plan assets		(19.0	)		(19.5	)		(16.7	)		—			—			—
Amortization of prior service cost		0.4			0.5			0.5			(1.9	)		(1.9	)		(1.9	)
Recognized actuarial loss		7.0			5.1			8.9			1.2			1.2			1.2
Settlements and curtailments		1.7			1.4			1.0			—			—			(0.6	)
Net periodic benefit cost	$	13.3		$	10.1		$	16.8		$	1.0		$	0.7		$	—

Summary of amounts recognized in AOCI in our financial statements

	Pension Benefits						Other Benefits
	2011			2010			2011			2010
Amounts recognized in other comprehensive income (loss):
Prior service costs	$	(2.6	)	$	(3.5	)	$	12.7		$	14.7
Actuarial loss		(212.0	)		(176.2	)		(20.8	)		(19.8	)
Subtotal		(214.6	)		(179.7	)		(8.1	)		(5.1	)
Deferred taxes		78.6			66.2			3.1			1.9
Net amount recognized	$	(136.0	)	$	(113.5	)	$	(5.0	)	$	(3.2	)
Changes recognized in other comprehensive income (loss):
Current year prior service costs	$	—		$	—			—		$	(0.1	)
Current year actuarial loss		44.4			25.8			2.3			2.4
Effect of exchange rates		(0.4	)		0.3			—			—
Amortization of prior service (costs) credits		(0.9	)		(0.5	)		1.9			1.9
Amortization of actuarial loss		(8.2	)		(6.5	)		(1.2	)		(1.3	)
Total recognized in other comprehensive income	$	34.9		$	19.1		$	3.0		$	2.9
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$	48.2		$	29.2		$	4.0		$	3.6

	Pension Benefits						Other Benefits
	2011			2010			2011			2010
Weighted-average assumptions used to determine benefit obligations as of December 31:
Discount rate		4.83	%		5.45	%		4.64	%		5.30	%
Rate of compensation increase		4.23			4.23			—			—

	Pension Benefits									Other Benefits
	2011			2010			2009			2011			2010			2009
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate		5.45	%		6.07	%		6.27	%		5.30	%		5.95	%		6.42	%
Expected long-term return on plan assets		8.00			8.00			8.25			—			—			—
Rate of compensation increase		4.23			4.23			4.19			—			—			—

Summary of health care cost trend rates

	2011			2010
Assumed health care cost trend rates as of December 31:
Health care cost trend rate assumed for next year		8.40	%		8.50	%
Rate to which the cost rate is assumed to decline (the ultimate trend rate)		5.00	%		5.00	%
Year that the rate reaches the ultimate trend rate		2020			2020

Summary of one percentage-point change in assumed healthcare cost trend rate

	1-Percentage- Point Increase		1-Percentage- Point Decrease
Effect on total of service and interest cost	$	0.2	$	(0.2	)
Effect on the postretirement benefit obligation		2.0		(1.7	)

Summary of expected future benefit payments

	Years Ended December 31,
	2012		2013		2014		2015		2016		2017- 2021
Pension benefits	$	16.5	$	18.8	$	17.3	$	18.5	$	18.7	$	109.2
Other benefits		1.3		1.3		1.3		1.3		1.4		7.7

Summary of weighted-average asset allocations

	Plan Assets as of December 31,
Asset Category	2011			2010
U.S. equity		33.6	%		33.1	%
International equity		24.4			28.5
Fixed income		41.2			36.8
Money market/cash/guaranteed investment contracts		0.8			1.6
Total		100	%		100.0	%

Summary of target allocation percentage of assets

U.S. pension plan investments are invested within the following range targets:

Asset Category	Target
U.S. equity		36.0	%
International equity		24.0	%
Fixed income		38.0	%
Money market/cash/guaranteed investment contracts		2.0	%

Summary of fair value of pension plan asset, by asset category

	Fair Value Measurements as of December 31, 2011
	Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets Category:
Cash and cash equivalents	$	3.7	$	—	$	—	$	3.7
Commingled pools/Collective Trusts
U.S. equity(1)		—		33.4		—		33.4
International equity(2)		—		48.3		—		48.3
Fixed income(3)		—		81.9		—		81.9
Mutual funds
U.S. equity(4)		38.8		—		—		38.8
International equity(4)		4.4		—		—		4.4
Fixed income(5)		6.9		—		—		6.9
Balanced pension trust(6)
U.S. equity		—		2.1		—		2.1
International equity		—		6.5		—		6.5
Bonds		—		4.4		—		4.4
Pension fund
U.S. equity(7)		—		1.1		—		1.1
International equity(7)		—		5.5		—		5.5
Fixed income(8)		—		4.8		—		4.8
Money market instruments(9)		—		0.7		—		0.7
Guaranteed investment contracts		—		—		—		—
Total	$	53.8	$	188.7	$	—	$	242.5

	Fair Value Measurements as of December 31, 2010
	Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets Category:
Cash and cash equivalents	$	3.9	$	—	$	—	$	3.9
Commingled pools / Collective Trusts
U.S. equity(1)		—		33.7		—		33.7
International equity(2)		—		53.8		—		53.8
Fixed income(3)		—		74.0		—		74.0
Mutual funds
U.S. equity(4)		38.2		—		—		38.2
International equity(4)		6.5		—		—		6.5
Fixed income(5)		6.2		—		—		6.2
Balanced pension trust(6)
U.S. equity		—		2.1		—		2.1
International equity		—		7.4		—		7.4
Bonds		—		5.3		—		5.3
Pension fund
U.S. equity(7)		—		1.1		—		1.1
International equity(7)		—		5.7		—		5.7
Fixed income(8)		—		4.1		—		4.1
Money market instruments(9)		—		0.8		—		0.8
Guaranteed investment contracts		—		1.8		—		1.8
Total	$	54.8	$	189.8	$	—	$	244.6

Summary of additional information about asset measured at net asset value per share

	As of December 31, 2011
	Fair Value		Redemption Frequency (if currently eligible)	Redemption Notice Period
Assets Category:
Commingled pools/Collective Trusts
U.S. equity(1)	$	33.4	n/a	n/a
International equity(2)		48.3	Monthly	10 —15 days
Fixed income(3)		81.9	Quarterly	15 days
Mutual funds
U.S. equity(4)		38.8	n/a	n/a
International equity(4)		4.4	n/a	n/a
Fixed income(5)		6.9	n/a	n/a
Balanced pension trust(6)
U.S. equity		2.1	Daily	5 days
International equity		6.5	Daily	5 days
Bonds		4.4	Daily	5 days
Pension fund
U.S. equity(7)		1.1	Daily	7 days
International equity(7)		5.5	Daily	7 days
Fixed income(8)		4.8	Daily	7 days
Money market instruments(9)		0.7	Daily	7 days
Total	$	238.8

	As of December 31, 2010
	Fair Value		Redemption Frequency(if currently eligible)	Redemption Notice Period
Assets Category:
Commingled pools/Collective Trusts
U.S. equity(1)	$	33.7	n/a	n/a
International equity(2)		53.8	Monthly	10 —15 days
Fixed income(3)		74.0	Quarterly	15 days
Mutual funds
U.S. equity(4)		38.2	n/a	n/a
International equity(4)		6.5	n/a	n/a
Fixed income(5)		6.2	n/a	n/a
Balanced pension trust(6)
U.S. equity		2.1	Daily	5 days
International equity		7.4	Daily	5 days
Bonds		5.3	Daily	5 days
Pension fund
U.S. equity(7)		1.1	Daily	7 days
International equity(7)		5.7	Daily	7 days
Fixed income(8)		4.1	Daily	7 days
Money market instruments(9)		0.8	Daily	7 days
Total	$	238.9

(1) This category includes investments primarily in U.S. equity securities that include large, mid and small capitalization companies.

(2) This category includes investments primarily in non-U.S. equity securities that include large, mid and small capitalization companies in large developed markets as well as emerging markets equities.

(3) This category includes investments in U.S. investment grade and high yield fixed income securities, non-U.S. fixed income securities and emerging markets fixed income securities.

(4) These funds seek capital appreciation and generally invest in common stocks of U.S. and non-U.S. issuers. They may invest in growth stocks or value stocks.

(5) This fund seeks to provide inflation protection. It currently invests at least 80% of its assets in inflation-indexed bonds issued by the U.S. government. It may invest in bonds of any maturity, though the fund typically maintains a dollar-weighted average maturity of 7 to 20 years.

(6) The investment objectives of the fund are to provide long-term capital growth and income by investing primarily in a well-diversified, balanced portfolio of Canadian common stocks, bonds and money market securities. The fund also holds a portion of its assets in U.S. and non-U.S. equities.

(7) This category includes investments in U.S. and non-U.S. equity securities and aims to provide returns consistent with the markets in which it invests and provide broad exposure to countries around the world.

(8) This category includes investments in U.K. government index-linked securities (index-linked gilts) that have maturity periods of 5 years or longer and investment grade corporate bonds denominated in sterling.

(9) This fund invests in U.K. money market instruments and includes cash, bank deposits and short-term fixed interest investments.