Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 22.8	$ (0.4)	$ 33.1	$ 3.4
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:
Depreciation and amortization	27.8	28.5	55.8	54.3
Stock-based compensation expense	3.4	1.2	4.8	2.1
Deferred tax expense	8.9	4.3	10.7	5.2
Employee benefit plans	1.2	0.3	2.0	0.3
Gain (Loss) on Extinguishment of Debt	1.0	0.0	1.0	0.0
Gain on divested assets	0.0	0.0	1.4	0.0
Increase (Decrease) in Accounts Receivable	18.8	(2.7)	(18.5)	(25.8)
Increase (Decrease) in Inventories	5.1	(3.4)	46.1	(25.0)
Increase (Decrease) in Other Current Assets	3.6	3.1	(5.4)	(5.7)
Increase (Decrease) in Accounts Payable, Trade	(11.6)	3.5	(24.6)	(7.3)
Increase (Decrease) in Employee Related Liabilities	16.5	7.7	5.6	(4.2)
Increase (Decrease) in Other Accrued Liabilities	10.4	2.8	10.3	16.3
Other, net	1.2	(0.8)	1.6	1.2
Net cash provided by operating activities	109.0	44.1	121.1	14.7
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to plant and equipment	(7.3)	(36.8)	(17.8)	(108.4)
Net cash used for investing activities	(7.3)	(36.8)	(17.8)	(108.4)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings of short-term debt	20.0	146.6	108.5	436.9
Repayments of short-term debt	(73.9)	(123.8)	(122.7)	(322.8)
Repayments of Long-term Debt	(60.4)	0.0	(61.5)	0.0
Other, net	0.0	(0.4)	(0.9)	(1.1)
Net cash (used for) provided by financing activities	(114.3)	22.4	(76.5)	113.0
Increase (decrease) in cash, cash equivalents and restricted cash	(12.6)	29.7	26.7	19.3
Cash, cash equivalents and restricted cash at beginning of period	61.8	14.6	22.4	24.9
Cash, cash equivalents and restricted cash at end of period	49.2	44.3	49.2	44.3
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest, net of amounts capitalized	4.9	1.3	24.2	16.4
Income Taxes Paid, Net	(2.2)	1.9	(2.2)	1.7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 49.2	$ 44.3	$ 49.2	$ 44.3