CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net Income (Loss)	$ (8.4)	$ 31.1	$ 64.5
Adjustments to reconcile net income to net cash provided by (used in) operations:
Depreciation and amortization	119.5	55.7	55.0
Deferred income taxes	(20.1)	16.9	8.8
Gains on asset transactions, net of impairment losses	(11.6)	(35.8)	(82.2)
Share-based compensation expense	4.1	4.7	4.9
Investments in affiliates, net of distributions	1.4	(3.7)	0.1
Changes in operating assets and liabilities:
Trade, contracts retention, and other receivables	4.3	(3.1)	1.6
Costs and estimated earnings in excess of billings on uncompleted contracts - net	0.7	(1.4)	(6.4)
Inventories	12.7	25.9	(13.5)
Prepaid expenses, income tax receivable and other assets	(0.1)	(12.5)	6.3
Accrued pension and post-retirement benefits	6.3	3.6	(2.3)
Accounts payable and contracts retention	(0.4)	0.1	(2.3)
Accrued and other liabilities	10.7	(18.2)	(6.0)
Real estate inventory sales (real estate developments held for sale)	7.4	73.0	53.6
Expenditures for real estate inventory (real estate developments held for sale)	(15.3)	(7.2)	(41.7)
Net cash provided by operations	111.2	129.1	40.4
Cash Flows used in Investing Activities:
Capital expenditures for property, plant and equipment	(108.6)	(43.4)	(60.2)
Capital expenditures related to forward 1031 commercial property transactions	(7.5)	(1.3)	(14.9)
Proceeds from investment tax credits and grants related to Port Allen Solar Farm	0.0	0.0	4.5
Proceeds from disposal of property and other assets	19.6	8.1	9.5
Proceeds from disposals related to 1031 commercial property transactions	69.2	40.0	85.6
Payments for purchases of investments in affiliates and other investments	(47.2)	(29.4)	(75.1)
Proceeds from investments in affiliates and other investments	41.3	44.4	36.2
Change in restricted cash associated with 1031 transactions	7.6	(17.4)	0.6
Acquisition of business, net of cash (including Grace indemnity holdback)	0.0	0.0	(14.2)
Net cash provided by (used in) investing activities	(25.6)	1.0	(28.0)
Cash Flows from Financing Activities:
Proceeds from issuances of long-term debt	272.0	132.0	283.0
Payments of long-term debt and deferred financing costs	(334.3)	(248.1)	(224.2)
Payments on line-of-credit agreement, net	(9.9)	(3.0)	(62.3)
Distribution to noncontrolling interests	(1.4)	(1.1)	(0.2)
Dividends paid	(12.3)	(10.3)	(8.3)
Proceeds from issuance (repurchase) of capital stock and other, net	1.2	(1.1)	(0.9)
Net cash used in financing activities	(84.7)	(131.6)	(12.9)
Cash and Cash Equivalents:
Net increase (decrease) for the year	0.9	(1.5)	(0.5)
Balance, beginning of year	1.3	2.8	3.3
Balance, end of year	2.2	1.3	2.8
Other Cash Flow Information:
Interest paid, net of amounts capitalized	(26.2)	(27.3)	(29.8)
Income taxes paid	0.0	(6.4)	(14.2)
Non-cash Investing and Financing Activities:
Contribution of land and development assets to joint ventures	0.0	9.6	33.8
Real estate exchanged for note receivable	0.0	1.9	3.6
Declared distribution from investment in affiliate	8.0	0.0	0.0
Declared distribution to noncontrolling interest	0.9	0.4	1.1
Asset retirement obligations	5.4	6.0	0.0
Capital expenditures included in accounts payable and accrued expenses	$ 1.3	$ 8.0	$ 5.7