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Postretirement and Other Benefits (Tables)

12 Months Ended

Dec. 31, 2014

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Funded Status

The funded status of these plans as of December 31, 2014 and 2013 was as follows ($ in millions):

	Pension Benefits																OPEB Benefits
	United States								France								United States
	2014				2013				2014				2013				2014				2013
Change in Projected Benefit Obligation, or PBO:
PBO at beginning of year	$	121.6			$	132.6			$	37.7			$	33.6			$	2.8			$	5.4
Service cost	—				—				1.3				1.3				—				0.1
Interest cost	5.6				5.1				0.8				0.8				0.1				0.1
Actuarial (gain) loss	14.6				(8.8		)		4.4				2.6				(0.1		)		(0.7		)
Participant contributions	—				—				—				—				0.2				0.3
Plan amendment	(2.1		)		—				—				—				(0.6		)		(1.7		)
Gross benefits paid	(7.3		)		(7.3		)		(1.7		)		(2.0		)		(0.6		)		(0.7		)
Currency translation effect	—				—				(5.2		)		1.4				—				—
PBO at end of year	$	132.4			$	121.6			$	37.3			$	37.7			$	1.8			$	2.8
Change in Plan Assets:
Fair value of plan assets at beginning of year	126.0				120.4				12.3				13.4				—				—
Actual return on plan assets	12.3				12.2				0.5				(0.4		)		—				—
Employer contributions	—				0.7				1.0				0.8				0.4				0.4
Participant contributions	—				—				—				—				0.2				0.3
Plan amendment	(2.1		)		—				—				—				—				—
Gross benefits paid	(7.3		)		(7.3		)		(2.2		)		(2.0		)		(0.6		)		(0.7		)
Currency translation effect	—				—				(1.4		)		0.5				—				—
Fair value of plan assets at end of year	$	128.9			$	126.0			$	10.2			$	12.3			$	—			$	—
Funded status at end of year	$	(3.5	)		$	4.4			$	(27.1	)		$	(25.4	)		$	(1.8	)		$	(2.8	)

Schedule of Accumulated Benefit Obligations and PBO excess of Fair Value of Pension Plan Assets

The PBO and Accumulated Benefit Obligations (ABO) exceeded the fair value of pension plan assets for the Company's French defined benefit pension plans as of December 31, 2014 and 2013 and U.S. defined benefit plan as of December 31, 2014 as follows ($ in millions):

	United States								France
	2014				2013				2014				2013
PBO	$	132.4			$	121.6			$	37.3			$	37.7
ABO	132.4				121.6				32.2				31.2
Fair value of plan assets	128.9				126.0				10.2				12.3

Schedule of Defined Benefit Plan Amounts Recognized in Accumulated Other Comprehensive Income

As of December 31, 2014, the pre-tax amounts in accumulated other comprehensive income that have not been recognized as components of net periodic benefit cost for the U.S. and French pension plans and other postretirement benefit plans in the United States are as follows ($ in millions):

	Pension Benefits								OPEB Benefits
	United States				France				United States
Accumulated loss	$	42.1			$	19.0			$	1.0
Prior service credit	—				(4.4		)		(1.1		)
Accumulated other comprehensive loss (income)	$	42.1			$	14.6			$	(0.1	)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year

The amounts in accumulated other comprehensive loss at December 31, 2014, which are expected to be recognized as components of U.S. and French net periodic benefit cost in 2015 are as follows ($ in millions):

	Pension Benefits								OPEB Benefits
	United States				France				United States
Amortization of accumulated loss	$	(5.5	)		$	(1.5	)		$	(0.3	)
Amortization of prior service credit	—				0.3				0.6
Total	$	(5.5	)		$	(1.2	)		$	0.3

Schedule of Net Benefit Costs

The components of net pension and OPEB benefit costs for U.S. employees and net pension benefit costs for French employees during the years ended December 31, 2014, 2013 and 2012 were as follows ($ in millions):

	U.S. Pension Benefits												French Pension Benefits												U.S. OPEB Benefits
	2014				2013				2012				2014				2013				2012				2014				2013				2012
Service cost	$	—			$	—			$	—			$	1.3			$	1.3			$	0.9			$	—			$	0.1			$	0.1
Interest cost	5.6				5.1				5.5				0.8				0.8				1.0				0.1				0.1				0.4
Expected return on plan assets	(7.4		)		(7.1		)		(7.6		)		(0.4		)		(0.4		)		(0.6		)		—				—				—
Amortizations and other	4.2				6.7				5.9				0.7				0.5				0.4				(0.5		)		(0.7		)		(0.3		)
Curtailment benefit	—				—				—				—				—				—				(2.7		)		(3.2		)		—
Net periodic benefit cost	$	2.4			$	4.7			$	3.8			$	2.4			$	2.2			$	1.7			$	(3.1	)		$	(3.7	)		$	0.2

Schedule of Allocation of Plan Assets

The following table sets forth by level, within the fair value hierarchy, the U.S. and French pension plans' assets at fair value as of December 31, 2014 ($ in millions):

	United States																France
Plan Asset Category	Total				Level 1				Level 2				Level 3				Total				Level 1				Level 2
Cash equivalents	$	1.1			$	1.1			$	—			$	—			$	1.1			$	1.1			$	—
Equity securities
Domestic Large Cap	7.2				—				7.2				—				1.7				1.7				—
Domestic Small Cap	5.5				—				5.5				—				—				—				—
International	21.3				—				21.3				—				—				—				—
Fixed income securities	87.0				—				87.0				—				7.3				—				7.3
Alternative investments*	6.8				—				—				6.8				0.1				—				0.1
Total	$	128.9			$	1.1			$	121.0			$	6.8			$	10.2			$	2.8			$	7.4

The following table sets forth by level, within the fair value hierarchy, the U.S. and French pension plans' assets at fair value as of December 31, 2013 ($ in millions):

	United States																France
Plan Asset Category	Total				Level 1				Level 2				Level 3				Total				Level 1				Level 2
Cash equivalents	$	3.6			$	3.6			$	—			$	—			$	3.1			$	3.1			$	—
Equity securities
Domestic Large Cap	31.1				31.1				—				—				2.3				2.3				—
Domestic Small Cap	10.1				10.1				—				—				—				—				—
International	15.2				10.0				5.2				—				—				—				—
Fixed income securities	59.6				59.6				—				—				6.8				—				6.8
Alternative investments*	6.4				—				—				6.4				0.1				—				0.1
Total	$	126.0			$	114.4			$	5.2			$	6.4			$	12.3			$	5.4			$	6.9

*    Alternative investments include ownership interests in shares of registered investment companies.

The U.S. and French pension plans' asset target allocations by asset category for 2015 and actual allocations by asset category at December 31, 2014 and 2013 were as follows:

	United States									France
	2015 Target			2014			2013			2014			2013
Asset Category
Cash and cash equivalents	1	%		1	%		3	%		11	%		25	%
Equity securities*
Domestic Large Cap	8			5			25			17			19
Domestic Small Cap	2			4			8
International	17			17			12
Fixed income securities	67			68			47			71			55
Alternative investments**	5			5			5			1			1
Total	100	%		100	%		100	%		100	%		100	%

* None of the Company's pension plan assets are targeted for investment in SWM stock, except that it is possible that one or more mutual funds held by the plan could hold shares of SWM.

** Investments in this category under the U.S. pension plan only may include hedge funds, and may include real estate under the French pension plan.

Schedule of Changes in Plan Assets

The following table shows the changes in Level 3 asset values ($ in millions):

U.S. Level 3 Asset Reconciliation	Alternative Investments Total
Beginning balance, January 1, 2012	$	6.0
Realized and unrealized gains	0.6
Purchases	—
Sales	(0.2		)
Ending balance, December 31, 2013	6.4
Realized and unrealized gains	0.5
Purchases	—
Sales	(0.1		)
Ending balance, December 31, 2014	$	6.8

Schedule of Expected Benefit Payments

The Company expects the following estimated undiscounted future pension benefit payments for the United States and France and future postretirement healthcare and life insurance benefit payments for the United States, which are to be made from pension plan and employer assets, net of amounts that will be funded from retiree contributions, and which reflect expected future service, as appropriate ($ in millions):

	United States								France
	Pension Benefits				Healthcare and Life Insurance Benefits				Pension Benefits
2015	$	8.0			$	0.4			$	1.8
2016	8.0				0.3				1.8
2017	8.1				0.2				4.0
2018	8.3				0.1				1.2
2019	8.3				0.1				2.5
2020 - 2024	41.7				0.4				7.7

Benefit Obligations [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used

The weighted average assumptions used to determine benefit obligations as of December 31, 2014 and 2013 were as follows:

	Pension Benefits												OPEB Benefits
	United States						France						United States
	2014			2013			2014			2013			2014			2013
Discount rate	3.94	%		4.78	%		1.17	%		2.38	%		3.82	%		4.30	%
Rate of compensation increase	—	%		—	%		1.90	%		2.50	%		3.50	%		3.50	%

Net Periodic Benfit Cost [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used

The weighted average assumptions used to determine net periodic benefit costs for the years ended December 31, 2014, 2013 and 2012 were as follows:

	Pension Benefits																		OPEB Benefits
	United States									France									United States
	2014			2013			2012			2014			2013			2012			2014			2013			2012
Discount rate	4.78	%		4.00	%		4.50	%		1.17	%		2.38	%		4.40	%		4.02	%		3.25	%		4.50	%
Expected long-term rate of return on plan assets	6.48	%		6.50	%		7.00	%		3.00	%		3.25	%		3.25	%		—			—			—
Rate of compensation increase	—			—			—	%		1.90	%		2.50	%		2.50	%		3.50	%		3.50	%		3.50	%

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