Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | ||
---|---|---|---|---|
Mar. 31, 2014
|
Sep. 30, 2013
|
Mar. 31, 2015
|
Sep. 30, 2014
|
|
Business Information [Line Items] | ||||
Cash and Cash Equivalents, at Carrying Value | $ 993.4 | $ 977.4 | $ 697.7 | $ 661.8 |
Homebuilding [Member] | ||||
Business Information [Line Items] | ||||
Earnest Money Deposits | 64.4 | |||
Cash and Cash Equivalents, at Carrying Value | 665.8 | 632.5 | ||
Homebuilding [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | ||||
Business Information [Line Items] | ||||
Earnest Money Deposits | 60.4 | 55.7 | ||
Cash and Cash Equivalents [Member] | ||||
Business Information [Line Items] | ||||
Prior Period Reclassification Adjustment | 42.0 | 40.9 | ||
Subsidiaries [Member] | ||||
Business Information [Line Items] | ||||
Cash and Cash Equivalents, at Carrying Value | $ 40.5 | $ 43.3 |