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Guarantor Subsidiaries (Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 75.4	$ 170.0	$ 169.0	$ 153.8
Accounts receivable—trade, less allowance for doubtful accounts	231.2	225.2
Inventories, at lower of cost or market	215.1	182.5
Prepaid expenses and other current assets	19.6	36.5
Total current assets	541.3	614.2
Property, plant and equipment, at cost less accumulated depreciation and amortization	1,741.9	1,679.5
Investments in subsidiaries	0.0	0.0
Other assets	42.4	37.3
Total assets	2,325.6	2,331.0
Current liabilities
Current maturities of long-term debt	21.2	19.9
Inter-company accounts payable	0.0	0.0
Trade accounts payable and accrued liabilities	519.6	513.4
Total current liabilities	540.8	533.3
Long-term debt, including capitalized lease obligations	846.6	860.9
Deferred income taxes	168.1	154.2
Asset retirement obligations	30.0	28.2
Deferred credits and other liabilities	11.2	16.0
Total liabilities	1,596.7	1,592.6
Stockholders' Equity
Preferred Stock	0.0	0.0
Common Stock	0.5	0.5
Treasury Stock	(941.6)	(806.5)
Additional paid in capital (APIC)	539.4	549.9
Retained earnings	1,130.6	994.5
Total stockholders' equity	728.9	738.4	665.1	697.1
Total liabilities and stockholders' equity	2,325.6	2,331.0
Eliminations
Current assets
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts receivable—trade, less allowance for doubtful accounts	0.0	0.0
Inventories, at lower of cost or market	0.0	0.0
Prepaid expenses and other current assets	0.0	0.0
Total current assets	0.0	0.0
Property, plant and equipment, at cost less accumulated depreciation and amortization	0.0	0.0
Investments in subsidiaries	(2,504.3)	(2,368.3)
Other assets	0.0	0.0
Total assets	(2,504.3)	(2,368.3)
Current liabilities
Current maturities of long-term debt	0.0	0.0
Inter-company accounts payable	0.0	0.0
Trade accounts payable and accrued liabilities	0.0	0.0
Total current liabilities	0.0	0.0
Long-term debt, including capitalized lease obligations	0.0	0.0
Deferred income taxes	0.0	0.0
Asset retirement obligations	0.0	0.0
Deferred credits and other liabilities	0.0	0.0
Total liabilities	0.0	0.0
Stockholders' Equity
Preferred Stock	0.0	0.0
Common Stock	(0.1)	(0.1)
Treasury Stock	0.0	0.0
Additional paid in capital (APIC)	(1,368.4)	(1,368.4)
Retained earnings	(1,135.8)	(999.8)
Total stockholders' equity	(2,504.3)	(2,368.3)
Total liabilities and stockholders' equity	(2,504.3)	(2,368.3)
Parent Company | Reportable Legal Entities
Current assets
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts receivable—trade, less allowance for doubtful accounts	0.0	0.0
Inventories, at lower of cost or market	0.0	0.0
Prepaid expenses and other current assets	0.0	0.0
Total current assets	0.0	0.0
Property, plant and equipment, at cost less accumulated depreciation and amortization	0.0	0.0
Investments in subsidiaries	2,359.5	2,223.4
Other assets	0.0	0.0
Total assets	2,359.5	2,223.4
Current liabilities
Current maturities of long-term debt	0.0	0.0
Inter-company accounts payable	973.6	829.2
Trade accounts payable and accrued liabilities	0.0	0.0
Total current liabilities	973.6	829.2
Long-term debt, including capitalized lease obligations	0.0	0.0
Deferred income taxes	0.0	0.0
Asset retirement obligations	0.0	0.0
Deferred credits and other liabilities	0.0	0.0
Total liabilities	973.6	829.2
Stockholders' Equity
Preferred Stock	0.0	0.0
Common Stock	0.5	0.5
Treasury Stock	(941.6)	(806.5)
Additional paid in capital (APIC)	1,196.4	1,205.7
Retained earnings	1,130.6	994.5
Total stockholders' equity	1,385.9	1,394.2
Total liabilities and stockholders' equity	2,359.5	2,223.4
Issuer | Reportable Legal Entities
Current assets
Cash and cash equivalents	74.7	169.9	169.0	153.8
Accounts receivable—trade, less allowance for doubtful accounts	231.2	225.2
Inventories, at lower of cost or market	215.1	182.5
Prepaid expenses and other current assets	19.6	36.5
Total current assets	540.6	614.1
Property, plant and equipment, at cost less accumulated depreciation and amortization	1,739.9	1,678.3
Investments in subsidiaries	144.8	144.9
Other assets	42.4	37.3
Total assets	2,467.7	2,474.6
Current liabilities
Current maturities of long-term debt	21.2	19.9
Inter-company accounts payable	(770.0)	(624.1)
Trade accounts payable and accrued liabilities	519.6	513.4
Total current liabilities	(229.2)	(90.8)
Long-term debt, including capitalized lease obligations	846.6	860.9
Deferred income taxes	168.1	154.2
Asset retirement obligations	30.0	28.2
Deferred credits and other liabilities	11.2	16.0
Total liabilities	826.7	968.5
Stockholders' Equity
Preferred Stock	0.0	0.0
Common Stock	0.0	0.0
Treasury Stock	0.0	0.0
Additional paid in capital (APIC)	571.9	573.1
Retained earnings	1,069.1	933.0
Total stockholders' equity	1,641.0	1,506.1
Total liabilities and stockholders' equity	2,467.7	2,474.6
Guarantor Subsidiaries | Reportable Legal Entities
Current assets
Cash and cash equivalents	0.7	0.1	0.0	0.0
Accounts receivable—trade, less allowance for doubtful accounts	0.0	0.0
Inventories, at lower of cost or market	0.0	0.0
Prepaid expenses and other current assets	0.0	0.0
Total current assets	0.7	0.1
Property, plant and equipment, at cost less accumulated depreciation and amortization	2.0	1.2
Investments in subsidiaries	0.0	0.0
Other assets	0.0	0.0
Total assets	2.7	1.3
Current liabilities
Current maturities of long-term debt	0.0	0.0
Inter-company accounts payable	(49.3)	(50.8)
Trade accounts payable and accrued liabilities	0.0	0.0
Total current liabilities	(49.3)	(50.8)
Long-term debt, including capitalized lease obligations	0.0	0.0
Deferred income taxes	0.0	0.0
Asset retirement obligations	0.0	0.0
Deferred credits and other liabilities	0.0	0.0
Total liabilities	(49.3)	(50.8)
Stockholders' Equity
Preferred Stock	0.0	0.0
Common Stock	0.1	0.1
Treasury Stock	0.0	0.0
Additional paid in capital (APIC)	52.0	52.0
Retained earnings	(0.1)	0.0
Total stockholders' equity	52.0	52.1
Total liabilities and stockholders' equity	2.7	1.3
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets
Cash and cash equivalents	0.0	0.0	$ 0.0	$ 0.0
Accounts receivable—trade, less allowance for doubtful accounts	0.0	0.0
Inventories, at lower of cost or market	0.0	0.0
Prepaid expenses and other current assets	0.0	0.0
Total current assets	0.0	0.0
Property, plant and equipment, at cost less accumulated depreciation and amortization	0.0	0.0
Investments in subsidiaries	0.0	0.0
Other assets	0.0	0.0
Total assets	0.0	0.0
Current liabilities
Current maturities of long-term debt	0.0	0.0
Inter-company accounts payable	(154.3)	(154.3)
Trade accounts payable and accrued liabilities	0.0	0.0
Total current liabilities	(154.3)	(154.3)
Long-term debt, including capitalized lease obligations	0.0	0.0
Deferred income taxes	0.0	0.0
Asset retirement obligations	0.0	0.0
Deferred credits and other liabilities	0.0	0.0
Total liabilities	(154.3)	(154.3)
Stockholders' Equity
Preferred Stock	0.0	0.0
Common Stock	0.0	0.0
Treasury Stock	0.0	0.0
Additional paid in capital (APIC)	87.5	87.5
Retained earnings	66.8	66.8
Total stockholders' equity	154.3	154.3
Total liabilities and stockholders' equity	$ 0.0	$ 0.0

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