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Stock-based Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2016

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.

	2016				2015				2014
	(in millions, except per share data)
Decrease in operating income	$	9.1			$	7.0			$	13.2
Decrease in net income	5.8				4.4				8.1
Decrease in earnings per basic share	0.04				0.03				0.05
Decrease in earnings per diluted share	0.04				0.03				0.05

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, 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
Granted	360,255			9.33
Vested	(510,535	)		7.94						4.7
Cancelled	(59,062	)		8.23
Outstanding at September 30, 2016	663,448			$	9.34			1.0

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

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

Award date		Settlement year		Performance period		Grant date per unit fair value				Units awarded			Units forfeited			Net units			Performance factor		Shares earned
November 27, 2012		2016		2013		$	5.22			135,553			—			135,553			2.000		271,106
				2014		$	8.52			135,553			—			135,553			2.000		271,106
				2015		$	9.78			135,552			—			135,552			0.000		—
December 3, 2013		2017		2014		$	8.52			90,841			(5,401	)		85,440			2.000		170,880
				2015		$	9.78			90,841			(5,401	)		85,440			0.000		—
				2016		$	9.38			90,849			(5,402	)		85,447			1.021		87,241
December 2, 2014		2018		2015		$	9.78			80,233			(7,318	)		72,915			0.000		—
				2016		$	9.38			80,229			(7,318	)		72,911			1.021		74,442
				2017						80,229			(7,319	)		72,910
December 1, 2015		2019		2016		$	9.38			77,821			(3,997	)		73,824			1.021		75,374
				2017						77,821			(3,997	)		73,824
				2018						77,829			(3,999	)		73,830

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, 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
Granted	—			—
Exercised	(270,599	)		6.83						0.8
Cancelled	(167,759	)		17.82
Outstanding at September 30, 2016	3,554,308			$	5.99			3.4		$	23.8
Exercisable at September 30, 2016	3,471,004			$	5.90			3.3		$	23.5
Expected to vest after September 30, 2016	83,304			$	9.54			8.0		$	0.3

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, 2016 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				1,343,036			$	3.34			4.4		1,343,036			$	3.34
	$	5.00		-	$	9.99				1,644,230			6.03				3.4		1,560,926			5.84
	$	10.00		-	$	14.99				440,984			11.31				1.0		440,984			11.31
	$	15.00		-	$	20.99				126,058			15.09				0.2		126,058			15.09
										3,554,308			$	5.99			3.4		3,471,004			$	5.90

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

Schedule of Share-based Compensation, Phantom Award, Activity

Phantom Plan activity 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, 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
Granted	302,875			9.84
Vested	(270,822	)								2.5
Cancelled	(56,905	)		9.28
Outstanding at September 30, 2016	534,026			$	9.60			0.9

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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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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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