Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Operations of Registrant (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Condensed Income Statements, Captions [Line Items]
Stockholders' Equity Attributable to Parent	$ 638.1				$ 586.7				$ 638.1	$ 586.7
Consolidated segment revenues									5,215.4	4,709.7	$ 4,634.7
Gross profit	485.7	$ 530.7	$ 462.8	$ 440.7	467.5	$ 458.4	$ 379.5	$ 376.8
Operating expenses:
Operating income									628.0	45.8	427.4
Other income (expense):
Interest Expense									(397.1)	(401.6)	(298.8)
Loss from the change in the fair value of the equity conversion feature of preferred stock										0.0	(12.7)
Other income (expense), net									1.0	10.2	(11.9)
Income (loss) from continuing operations before income taxes									231.9	(307.1)	104.0
Income tax expense (benefit)									41.5	(16.2)	89.6
Net income (loss) from continuing operations	36.2	(93.0)	15.9	7.0	(127.1)	(41.4)	(237.5)	(106.4)	(33.9)	(512.4)	101.7
Less: Preferred stock dividends, accretion and loss on conversion											73.6
Net loss attributable to common and participating preferred stockholders									(198.8)	(556.8)	(83.9)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	45.8	(234.5)	(40.6)	5.0	(32.1)	(16.7)	(152.4)	(20.3)	(224.3)	(221.5)	87.3
Net Income (Loss) Attributable to Parent	(7.3)	$ (132.9)	$ (24.7)	$ (33.9)	(143.1)	$ (75.6)	$ (228.3)	$ (109.8)	(198.8)	(556.8)	(10.3)
HGI
Condensed Income Statements, Captions [Line Items]
Consolidated segment revenues									0.0	0.0	0.0
Cost of revenues									0.0	0.0	0.0
Gross profit									0.0	0.0	0.0
Operating expenses:
General and administrative									50.7	100.2	111.1
Acquisition related charges									0.2	0.4	4.2
Total operating expenses									50.9	100.6	115.3
Operating income									(50.9)	(100.6)	(115.3)
Other income (expense):
Equity in net income (losses) of subsidiaries									(214.8)	(357.2)	207.7
Interest Expense									(143.1)	(124.2)	(89.7)
Loss from the change in the fair value of the equity conversion feature of preferred stock									0.0	0.0	(12.7)
Gain On Contingent Purchase Price Adjustment									0.0	8.5	0.5
Other income (expense), net									2.0	15.2	0.1
Income (loss) from continuing operations before income taxes									(406.8)	(558.3)	(9.4)
Income tax expense (benefit)									(208.0)	(1.5)	0.9
Net income (loss) from continuing operations									(198.8)	(556.8)	(10.3)
Less: Preferred stock dividends, accretion and loss on conversion									0.0	0.0	73.6
Net loss attributable to common and participating preferred stockholders									(198.8)	(556.8)	(83.9)
Discontinued Operations, Held-for-sale [Member]
Condensed Income Statements, Captions [Line Items]
Stockholders' Equity Attributable to Parent	$ 1,259.6				$ 1,209.9				1,259.6	1,209.9
Consolidated segment revenues									0.0	0.0
Operating expenses:
Operating income									0.0	0.0
Other income (expense):
Net income (loss) from continuing operations									(224.3)	(221.5)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									(224.3)	(221.5)
Discontinued Operations, Held-for-sale [Member] | HGI
Condensed Income Statements, Captions [Line Items]
Consolidated segment revenues											0.0
Operating expenses:
Operating income											0.0
Other income (expense):
Interest Expense											0.0
Loss from the change in the fair value of the equity conversion feature of preferred stock											0.0
Other income (expense), net											0.0
Income (loss) from continuing operations before income taxes											0.0
Income tax expense (benefit)											0.0
Net income (loss) from continuing operations											87.3
Less: Preferred stock dividends, accretion and loss on conversion											0.0
Net loss attributable to common and participating preferred stockholders											74.4
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest											87.3
Net Income (Loss) Attributable to Parent									$ (243.4)	$ (243.5)	$ 74.4