Revenues (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||
---|---|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Oct. 01, 2018 |
Sep. 30, 2018 |
|
Revenue from External Customer [Line Items] | ||||||
Contract with Customer, Liability | $ 9.9 | $ 9.9 | $ 6.4 | $ 0.0 | ||
Deferred income | 9.4 | 9.4 | $ 11.6 | |||
Other | 0.6 | $ 0.3 | 1.9 | $ 0.8 | ||
Revenue, Net (Deprecated 2018-01-31) | 88.2 | 23.6 | 192.0 | 77.0 | ||
Retail Land Sales, Improvement Revenue, Prior Sales (Deprecated 2018-01-31) | 1.0 | 4.8 | ||||
Real Estate [Member] | Residential Real Estate [Member] | ||||||
Revenue from External Customer [Line Items] | ||||||
Residential lot sales | 87.6 | 19.9 | 171.6 | 61.3 | ||
Land [Member] | Residential Real Estate [Member] | ||||||
Revenue from External Customer [Line Items] | ||||||
Residential lot sales | 0.0 | 3.4 | 0.0 | 5.7 | ||
Land [Member] | Commercial Real Estate [Member] | ||||||
Revenue from External Customer [Line Items] | ||||||
Residential lot sales | $ 0.0 | $ 0.0 | $ 18.5 | $ 9.2 |