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Employee Benefit Plans - Performance-Based Restricted Stock Units (Details) - Performance Shares [Member] - USD ($) $ / shares in Units, $ in Millions	1 Months Ended				12 Months Ended
	Nov. 15, 2017	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense					$ 15.7	$ 8.1	$ 3.4
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of percentage of units vested upon achieving performance criteria					0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of percentage of units vested upon achieving performance criteria					200.00%
November Two Thousand Fourteen Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target number of performance units				290,000
Granted, weighted average grant date fair value, per share				$ 23.62
Share-based compensation expense					$ 3.8	4.1	3.4
November Two Thousand Fifteen Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target number of performance units			330,000
Granted, weighted average grant date fair value, per share			$ 30.81
Share-based compensation expense					6.8	4.0	0.0
November Two Thousand Sixteen Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target number of performance units		330,000
Granted, weighted average grant date fair value, per share		$ 29.20
Share-based compensation expense					$ 5.1	$ 0.0	$ 0.0
Subsequent Event [Member] | November Two Thousand Fourteen Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awarded	471,250

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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Percentage of vesting of share-based compensation awards.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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