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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Share-based Compensation [Abstract]

Share-based compensation expense recorded in 'Selling and administrative expenses'

Share-based compensation expense and cash flow amounts were as follows:

	Year Ended December 31,
	2016				2015				2014
	(Dollars in millions)
Share-based compensation expense - equity classified awards	$	11.3			$	26.2			$	46.1
Share-based compensation expense - liability classified awards	1.5				2.0				0.7
Total share-based compensation expense	12.8				28.2				46.8
Tax benefit	—				—				17.3
Share-based compensation expense, net of tax benefit	$	12.8			$	28.2			$	29.5
Cash received upon the exercise of stock options and from employee stock purchases	—				3.4				5.5
Write-off tax benefits related to share-based compensation	—				—				(8.3		)

Summary of restricted stock award activity

A summary of restricted stock award activity is as follows:

	Year Ended December 31, 2016			Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2015	306,931			$	184.09
Granted	7,847			7.75
Vested	(76,663	)		277.28
Forfeited	(30,076	)		167.68
Canceled	(11,295	)		82.49
Nonvested at December 31, 2016	196,744			$	151.72

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

A summary of restricted stock unit activity is as follows:

	Year Ended December 31, 2016			Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2015	48,780			$	170.42
Granted	342,627			7.75
Vested	(23,220	)		149.84
Forfeited	(59,629	)		22.41
Nonvested at December 31, 2016	308,558			$	16.98

Schedule of Share-based Compensation, Stock Options, Activity

A summary of outstanding option activity under the plans is as follows:

	Year Ended December 31, 2016			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value (in millions)
Options Outstanding at December 31, 2015	240,428			$	388.16			6.28		$	—
Forfeited	(22,182	)		419.40
Options Outstanding at December 31, 2016	218,246			$	379.17			5.56		$	—
Vested and Exercisable	162,402			$	451.88			4.86		$	—

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The weighted-average fair values of the Company’s stock options and the assumptions used in applying the Black-Scholes option pricing model were as follows:

	Year Ended December 31,
	2015				2014
Weighted-average fair value	$	43.66			$	110.70
Risk-free interest rate	1.7		%		1.7		%
Expected option life	5 years				5 years
Expected volatility	45.2		%		48.4		%
Dividend yield	2.4		%		1.7		%

Summary of performance unit activity

A summary of performance unit activity is as follows:

	Year Ended December 31, 2016			Weighted Average Remaining Contractual Life
Nonvested at December 31, 2015	81,812			1.7
Forfeited	(5,916	)
Vested	(24,474	)
Nonvested at December 31, 2016	51,422			1.0

Assumptions used in the valuations for grants

The assumptions used in the valuations for grants were as follows:

	Year Ended December 31,
	2015			2014
Risk-free interest rate	1.1	%		0.8	%
Expected volatility	45.0	%		45.3	%
Dividend yield	2.4	%		1.7	%

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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-Name Accounting Standards Codification
-Topic 718
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-Section S99
-Paragraph 1
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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