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Supplemental Information (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
[1]
Mar. 31, 2015
[1]
Dec. 31, 2014
[1]
Sep. 30, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Supplemental Information [Line Items]                
Gain on land sales           $ 37.1 $ 9.7 $ 20.0
Advisory costs           0.0 0.0 10.1
Advisory costs, after-tax         $ 6.4      
Advisory costs, per share         $ 0.03      
Segment Reconciling Items [Member]                
Supplemental Information [Line Items]                
Gain on land sales $ 33.6 [1] $ 0.0 $ 0.0 $ 0.0   33.6 [1],[2] 0.0 [2] 0.0 [2]
Gain on land sales, after-tax $ 28.3              
Gain on land sales, per share $ 0.13              
Advisory costs           $ 0.0 $ 0.0 $ 10.1
[1] The gain is reflected on the consolidated income statements in “Other income (expense), net.” For additional information, see Note 24, Supplemental Information.
[2] Reflected on the consolidated income statements in "Other income (expense), net."