Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities:
Net income (loss)	$ 4.1	$ (43.4)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operations:
Depreciation and amortization	40.5	36.6
Loss (gain) from disposals and asset transactions, net	(9.5)	(2.6)
Impairment of assets	5.6	49.7
Share-based compensation expense	4.4	4.1
Equity in (income) loss from affiliates, net of operating cash distributions	(5.0)	(3.5)
Changes in operating assets and liabilities:
Trade, contracts retention, and other contract receivables	(2.1)	(6.9)
Inventories	1.2	2.6
Prepaid expenses, income tax receivable and other assets	7.9	25.8
Development/other property inventory	1.4	40.7
Accrued pension and post-retirement benefits	2.0	4.6
Accounts payable	(5.2)	(10.3)
Accrued and other liabilities	(8.1)	6.6
Net cash provided by (used in) operations	37.2	104.0
Cash Flows from Investing Activities:
Capital expenditures for acquisitions	0.0	(218.4)
Capital expenditures for property, plant and equipment	(17.7)	(31.8)
Proceeds from disposal of assets	27.1	3.0
Payments for purchases of investments in affiliates and other investments	0.0	(3.3)
Distributions of capital from investments in affiliates and other investments	11.1	12.2
Net cash provided by (used in) investing activities	20.5	(238.3)
Cash Flows from Financing Activities:
Proceeds from issuance of notes payable and other debt	173.0	111.8
Payments of notes payable and other debt and deferred financing costs	(105.3)	(155.3)
Borrowings (payments) on line-of-credit agreement, net	(8.7)	(5.1)
Distribution to noncontrolling interests	0.0	(0.3)
Cash dividends paid	(13.8)	(36.2)
Proceeds from issuance (repurchase) of capital stock and other, net	(1.0)	(1.0)
Payment of deferred acquisition holdback	0.0	(7.1)
Net cash provided by (used in) financing activities	44.2	(93.2)
Cash, Cash Equivalents and Restricted Cash
Net increase (decrease) in cash, cash equivalents and restricted cash	101.9	(227.5)
Balance, beginning of period	15.4	234.9
Balance, end of period	117.3	7.4
Other Cash Flow Information:
Interest paid, net of capitalized interest	(15.1)	(25.2)
Income tax (payments)/refunds, net	0.5	25.8
Noncash Investing and Financing Activities:
Capital expenditures included in accounts payable and accrued and other liabilities	2.5	2.6
Right-of-use ("ROU") assets and corresponding lease liability recorded upon ASC 842 adoption	0.0	31.0
Finance lease liabilities arising from obtaining ROU assets	0.4	1.7
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents, beginning of period	15.2	11.4
Restricted cash, beginning of period	0.2	223.5
Cash and cash equivalents, end of period	117.1	7.2
Restricted cash, end of period	0.2	0.2
Cash, cash equivalents and restricted cash	$ 117.3	$ 234.9