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Debt - Scheduled Maturities of Debt and Capital Lease Payments (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Jun. 30, 2015
May. 19, 2015
Apr. 14, 2015
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]              
Capital Leases, Future Minimum Payments Due, Next Twelve Months $ 7.2            
2017 885.4            
Capital Leases, Future Minimum Payments Due in Five Years 5.5            
2016 348.8            
Capital Leases, Future Minimum Payments Due in Four Years 5.6            
2015 22.5            
Capital Leases, Future Minimum Payments Due in Three Years 6.3            
2014 42.6            
Capital Leases, Future Minimum Payments Due in Two Years 7.1            
Long-term Debt, Maturities, Repayments of Principal in Year Five 20.9            
Capital Leases, Future Minimum Payments Due Thereafter 56.5            
Thereafter 5,088.2            
Capital Leases, Future Minimum Payments Due 88.2            
Long-term Debt 6,408.4       $ 5,194.5    
HGI              
Debt Instrument [Line Items]              
Long-term Debt, Maturities, Repayments of Principal in Year Five   $ 864.4          
Thereafter   $ 890.0          
Other Long-term Debt, Noncurrent 1,754.4            
Long-term Debt $ 1,736.4       1,325.0    
HGI | 7.875% Senior Secured Notes, due July 15, 2019              
Debt Instrument [Line Items]              
Long-term Debt     $ 160.0 $ 100.0   $ 225.0 $ 700.0
Secured Debt [Member] | HGI | 7.875% Senior Secured Notes, due July 15, 2019              
Debt Instrument [Line Items]              
Long-term Debt, Maturities, Repayments of Principal in Year Five         $ 604.4