Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

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,
	2014			2013			2012
	(Dollars in millions)
Share-based compensation expense - equity classified awards	$	46.1		$	50.9		$	45.4
Share-based compensation expense - liability classified awards	0.7			—			—
Total share-based compensation expense	46.8			50.9			45.4
Tax benefit	17.3			18.8			16.7
Share-based compensation expense, net of tax benefit	29.5			32.1			28.7
Cash received upon the exercise of stock options and from employee stock purchases	5.5			7.3			9.4
(Write-off) excess tax benefits related to share-based compensation	(8.3		)	(4.5		)	8.3

Summary of restricted stock award activity

A summary of restricted stock award activity is as follows:

	Year Ended December 31, 2014		Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2013	166,203		$	519.00
Granted	88,738		287.85
Vested	(28,341	)	863.85
Forfeited	(14,094	)	376.95
Nonvested at December 31, 2014	212,506		$	384.45

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, 2014		Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2013	19,158		$	292.50
Granted	14,534		292.20
Vested	(217	)	353.40
Forfeited	(335	)	321.00
Nonvested at December 31, 2014	33,140		$	291.60

Schedule of Share-based Compensation, Stock Options, Activity

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

	Year Ended December 31, 2014		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value (in millions)
Options Outstanding at December 31, 2013	153,005		$	559.80	6.00	$	0.5
Granted	69,628		291.60
Exercised	(2,996	)	153.30
Forfeited	(18,570	)	553.50
Options Outstanding at December 31, 2014	201,067		$	473.55	6.39	$	—
Vested and Exercisable	106,313		$	603.00	4.37	$	—

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,
	2014			2013			2012
Weighted-average fair value	$	110.70		$	181.95		$	278.85
Risk-free interest rate	1.7		%	0.7		%	0.9		%
Expected option life	5 years			5 years			5 years
Expected volatility	48.4		%	64.1		%	64.0		%
Dividend yield	1.7		%	1.2		%	0.6		%

Summary of performance unit activity

A summary of performance unit activity is as follows:

	Year Ended December 31, 2014		Weighted Average Remaining Contractual Life
Nonvested at December 31, 2013	30,888		1.6
Granted	42,961
Forfeited	(13,787	)
Vested	(10,051	)
Nonvested at December 31, 2014	50,011		1.5

Assumptions used in the valuations for grants

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

	Year Ended December 31,
	2014		2013		2012
Risk-free interest rate	0.8	%	0.4	%	0.4	%
Expected volatility	45.3	%	47.3	%	52.8	%
Dividend yield	1.7	%	1.4	%	0.6	%