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Stock-based Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

The effect of stock-based compensation on our statements of operations is presented below.

	2015				2014				2013
	(in millions, except per share data)
Decrease in operating income	$	7.0			$	13.2			$	11.4
Decrease in net income	4.4				8.1				6.9
Decrease in earnings per basic share	0.03				0.05				0.04
Decrease in earnings per diluted share	0.03				0.05				0.04

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

Restricted stock unit activity under the 2006 Plan is summarized below.

	Restricted stock units			Weighted average grant date fair value per unit				Weighted average remaining contractual term (years)		Aggregate intrinsic value   (millions)
Outstanding at September 30, 2012	2,423,762			$	4.13			1.0
Granted	509,338			5.37
Vested	(995,037	)		4.77						$	5.6
Cancelled	(12,723	)		12.28
Outstanding at September 30, 2013	1,925,340			4.30				0.9
Granted	381,012			8.51
Vested	(1,099,591	)		4.94						9.4
Cancelled	—			—
Outstanding at September 30, 2014	1,206,761			5.04				0.7
Granted	459,659			9.70
Vested	(793,630	)		3.99						7.7
Cancelled	—			—
Outstanding at September 30, 2015	872,790			$	8.45			0.8

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

Stock-settled PRSUs activity under the 2006 Plan is summarized below.

Award date		Performance period		Units awarded			Shares earned
November 27, 2012		2013		135,553			271,106
		2014		135,553			271,106
		2015		135,552			0
December 3, 2013		2014		90,841			181,682
		2015		90,841			0
		2016		90,849			n/a
December 2, 2014		2015		80,233			0
		2016		80,229			n/a
		2017		80,229			n/a

Schedule of Share-based Compensation. Options

Stock option activity under the 2006 Plan is summarized below.

	Options			Weighted average exercise price   per option				Weighted average remaining contractual term (years)		Aggregate intrinsic value   (millions)
Outstanding at September 30, 2012	5,522,610			$	6.30			6.8		$	3.5
Granted	125,780			5.91
Exercised	(384,475	)		4.97						1.2
Cancelled	(139,209	)		12.52
Outstanding at September 30, 2013	5,124,706			6.22				5.9		14.6
Granted	86,904			8.58
Exercised	(587,964	)		4.61						—
Cancelled	(71,411	)		12.92
Outstanding at September 30, 2014	4,552,235			6.37				5.0		13.6
Granted	97,119			9.97
Exercised	(506,632	)		3.42						3.2
Cancelled	(150,056	)		13.90
Outstanding at September 30, 2015	3,992,666			$	6.54			4.2		$	9.3
Exercisable at September 30, 2015	3,799,877			$	6.43			3.9		$	9.3
Expected to vest after September 30, 2015	192,789			$	8.76			8.6		$	0.1

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The ranges of exercise prices for stock options outstanding at September 30, 2015 are summarized below.

Exercise price										Options			Weighted average exercise price				Weighted average remaining contractual term (years)		Exercisable options			Weighted average exercise price
	$	0.00		-	$	4.99				1,395,711			$	3.34			5.4		1,395,711			$	3.34
	$	5.00		-	$	9.99				1,799,892			6.07				4.3		1,607,103			5.74
	$	10.00		-	$	14.99				515,846			11.30				2.0		515,846			11.30
	$	15.00		-	$	20.99				281,217			16.76				0.8		281,217			16.76
										3,992,666			$	6.54			4.2		3,799,877			$	6.43

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

The weighted average grant-date fair values of stock options granted and the weighted average assumptions used to determine these fair values are indicated below.

	2015				2014				2013
Grant-date fair value	$	5.93			$	5.13			$	5.91
Risk-free interest rate	1.74		%		2.44		%		1.63		%
Dividend yield	0.80		%		1.10		%		2.17		%
Expected life (years)	8.0				8.0				8.0
Expected annual volatility	0.6199				0.6386				0.6696

Schedule of Share-based Compensation, Phantom Award, Activity

Phantom Plan activity for 2015 is summarized below.

	Phantom Plan units			Weighted average grant date fair value   per unit				Weighted average remaining contractual term (years)		Aggregate intrinsic value   (millions)
Outstanding at September 30, 2012	358,866			$	2.03			1.2
Granted	382,605			5.22
Vested	(119,637	)								$	0.7
Cancelled	(12,852	)		2.03
Outstanding at September 30, 2013	608,982			4.03				1.0
Granted	304,815			8.52
Vested	(240,739	)								2.1
Cancelled	(29,770	)		5.29
Outstanding at September 30, 2014	643,288			6.22				0.8
Granted	289,524			9.78
Vested	(317,409	)								3.1
Cancelled	(56,525	)		8.29
Outstanding at September 30, 2015	558,878			$	8.49			0.8

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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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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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