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Subsequent Events Subsequent Events - Divestitures (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Subsequent Event [Line Items]            
Cash and cash equivalents $ 266.2 $ 447.9 $ 266.2 $ 447.9 $ 465.2 $ 643.2
Receivables, net 661.0   661.0   539.1  
Other assets 144.0   144.0   138.3  
Assets 35,495.5   35,495.5   33,580.1  
Debt [1],[2] 6,032.5   6,032.5   5,525.8  
Accounts payable and other current liabilities 941.8   941.8   983.2  
Other liabilities 40.5   40.5   28.7  
Liabilities 33,598.8   33,598.8   31,762.9  
Stockholders' Equity Attributable to Parent 729.3   729.3   638.1  
Noncontrolling interest 1,167.4   $ 1,167.4   $ 1,179.1  
Document Fiscal Year Focus     2017      
Operating income 148.2 188.1 $ 413.1 438.0    
Interest Expense 89.3 98.0 269.6 289.8    
Other (expense) income, net (2.0) 0.2 (2.3) (0.2)    
Net income (loss) 39.8 (93.0) 249.2 (70.1)    
Less: Net income attributable to noncontrolling interest 37.7 39.9 117.0 121.4    
Net Income (Loss) Attributable to Parent 2.1 (132.9) 132.2 (191.5)    
Compass Production Partners G.P. [Member]            
Subsequent Event [Line Items]            
Operating income   (22.1)   (113.3)    
Interest Expense   1.6   5.3    
Gain (Loss) on Disposition of Oil and Gas Property   0.0   105.6    
Other (expense) income, net   (2.3)   0.0    
Net income (loss) $ 0.0 $ (2.1) $ 0.0 $ (3.5)    
[1] The carrying value of cash and cash equivalents, trade receivables, accounts payable and accrued investment income approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.
[2] The fair value of debt set forth above is generally based on quoted or observed market prices.