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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities:      
Net income (loss) $ 8.8 $ (148.4) $ 47.0
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Long-lived asset and goodwill impairment 0.0 247.4 0.0
Depreciation and amortization expense 133.7 143.8 141.6
Deferred income tax expense (benefit) 12.1 (63.1) (3.4)
Payments in excess of expense for postretirement plan benefits (1.7) (1.9) (2.4)
Share-based compensation expense 3.8 4.5 3.1
(Gain) loss on extinguishment of debt, net (5.7) (1.5) 0.3
Loss from equity method investment 0.0 0.0 5.4
Changes in working capital pertaining to operating activities:      
Receivables, net 13.2 15.9 (6.9)
Inventories 21.8 (36.6) 0.6
Accounts payable (38.0) 23.5 (0.7)
Accrued liabilities 2.5 (2.4) (6.0)
Interest payable (0.2) (1.4) (1.8)
Income taxes (3.3) (1.5) 4.5
Other 10.8 3.6 4.5
Net cash provided by operating activities 157.8 181.9 185.8
Cash Flows from Investing Activities:      
Capital expenditures (73.9) (110.1) (100.3)
Sale of equity method investment 0.0 0.0 4.0
Other investing activities (1.4) 0.3 0.5
Net cash used in investing activities (75.3) (109.8) (95.8)
Cash Flows from Financing Activities:      
Proceeds from issuance of long-term debt 0.0 0.0 45.0
Repayment of long-term debt (55.9) (90.5) (45.7)
Debt issuance costs 0.0 (2.1) (0.5)
Proceeds from revolving facility 629.9 408.6 179.5
Repayment of revolving facility (684.9) (370.3) (204.5)
Proceeds from financing obligation 10.0 0.0 0.0
Repayment of financing obligations (3.0) (2.9) (2.6)
Dividends paid (19.9) (5.1) 0.0
Shares repurchased (7.0) (36.3) 0.0
Acquisition of additional interest in the Partnership 0.0 0.0 (4.2)
Cash distributions to noncontrolling interests 0.0 (14.2) (31.9)
Other financing activities (0.4) (7.9) 0.4
Net cash used in financing activities (131.2) (120.7) (64.5)
Net (decrease) increase in cash and cash equivalents (48.7) (48.6) 25.5
Cash and cash equivalents at beginning of year 97.1 145.7 120.2
Cash and cash equivalents at end of year 48.4 97.1 145.7
Supplemental Disclosure of Cash Flow Information      
Interest paid, net of capitalized interest of $0.2 million, $2.3 million and $3.2 million, respectively 51.8 58.2 59.6
Income taxes paid, net of refunds of $3.0 million, $0.3 million and $4.3 million, respectively $ 1.1 $ 9.5 $ 3.7