ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2015

Included in other operating income were the following:



	Years Ended December 31,
	2015			2014		2013
	($ in millions)
(Losses) gains on disposition of property, plant and equipment, net	$	(0.6	)	$	0.2	$	(1.1	)
Gains on dispositions of former manufacturing facilities	—			—		1.5
Gains on insurance recoveries	46.0			—		—
Gain on resolution of a contract matter	—			1.0		—
Other	0.3			0.3		0.3
Other operating income	$	45.7		$	1.5	$	0.7

Asset retirement obligation activity

The activity of our asset retirement obligation was as follows:



	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	54.4		$	60.8
Accretion	3.6			3.5
Spending	(8.2		)	(11.2		)
Currency translation adjustments	(1.1		)	(0.7		)
Acquisition activity	1.7			—
Adjustments	3.1			2.0
Ending balance	$	53.5		$	54.4

Other Assets

Included in other assets were the following:



	December 31,
	2015		2014
	($ in millions)
Investments in non-consolidated affiliates	$	25.0	$	23.3
Deferred debt issuance costs	34.2		10.3
Bleach joint venture receivable	—		7.8
Income tax receivable	1.5		6.6
Interest rate swaps	—		3.5
Supply contracts	406.5		—
Other	20.3		16.4
Other assets	$	487.5	$	67.9

Schedule of assumptions for the Black-Scholes option pricing model

The fair value of each option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following assumptions:



	2015			2014			2013
Dividend yield	2.92		%	3.13		%	3.44		%
Risk-free interest rate	1.69		%	2.13		%	1.35		%
Expected volatility	34		%	42		%	43		%
Expected life (years)	6.0			7.0			7.0
Weighted-average grant fair value (per option)	$	6.80		$	8.34		$	7.05
Weighted-average exercise price	$	27.40		$	25.69		$	23.28
Shares granted	776,750			624,200			621,000