Dispositions (Details) - Corporate and Other - ITF $ in Millions	Sep. 30, 2015 USD ($)
Assets and liabilities included in held for sale
Property, plant, and equipment, net of accumulated depreciation	$ 46.2
Accumulated depreciation	6.4
Accounts receivable and unbilled revenues	42.9
Materials, supplies, and inventories	16.6
Other current assets	5.1
Other long-term assets	29.4
Total assets	140.2
Accounts payable	11.9
Accrued payroll and benefits	1.8
Other current liabilities	7.1
Pension and other postretirement benefit obligations	0.4
Other long-term liabilities	0.4
Total liabilities	$ 21.6