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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Operations of Registrant (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Condensed Income Statements, Captions [Line Items]      
Stockholders' Equity Attributable to Parent $ 820.4   $ 758.0
Consolidated segment revenues 646.5 $ 602.3  
Operating expenses:      
Operating income 26.6 41.3  
Other income (expense):      
Interest Expense (75.5) (78.7)  
Other income, net 1.0 1.0  
Loss from continuing operations before income taxes (47.9) (36.4)  
Income tax (benefit) expense (126.0) 5.6  
Net income (loss) from continuing operations 578.9 260.8  
Net income attributable to common and participating preferred stockholders 507.4 212.2  
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 500.8 302.8  
Net Income (Loss) Attributable to Parent 507.4 212.2  
Discontinued Operations, Held-for-sale [Member]      
Condensed Income Statements, Captions [Line Items]      
Stockholders' Equity Attributable to Parent     $ 1,536.3
Operating expenses:      
Operating income 0.0 0.0  
Other income (expense):      
Net income (loss) from continuing operations 459.9 250.4  
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 459.9 250.4  
Net Income (Loss) Attributable to Parent 454.5 229.3  
Discontinued Operations, Held-for-sale [Member] | HGI      
Other income (expense):      
Net Income (Loss) Attributable to Parent $ 478.6 $ 259.4