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Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Operating Activities
Net income (loss)	$ 45.0	$ 67.9	$ 136.1	$ 120.4
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	34.2	29.0	99.0	83.5
Deferred and noncurrent income tax charges (credits)			13.9	17.4
Accretion of asset retirement obligations	0.5	0.4	1.5	1.3	$ 1.8
Pretax (gains) losses from sale of assets	0.5	0.0	0.7	3.4
Net (increase) decrease in noncash operating working capital			(15.8)	(58.3)
Other operating activities - net			6.0	(1.4)
Net cash provided by (required by) operating activities			241.4	166.3
Investing Activities
Property additions			(163.0)	(201.5)
Proceeds from sale of assets			1.2	0.7
Other investing activities - net			(5.9)	(4.6)
Net cash provided by (required by) investing activities			(167.7)	(205.4)
Financing Activities
Purchase of treasury stock			(144.4)	(152.0)
Borrowings of debt			0.0	338.8
Repayments of debt			(15.9)	(126.2)
Debt issuance costs			0.0	(1.1)
Amounts related to share-based compensation			(8.0)	(5.2)
Net cash provided by (required by) financing activities			(168.3)	54.3
Net increase (decrease) in cash and cash equivalents			(94.6)	15.2
Cash and cash equivalents at beginning of period			170.0	153.8	153.8
Restricted cash at beginning of period			0.0	0.0	0.0
Cash, cash equivalents, and restricted cash at beginning of period			170.0	153.8	153.8
Cash and cash equivalents at end of period	75.4	169.0	75.4	169.0	170.0
Restricted cash at end of period	0.0	0.0	0.0	0.0	0.0
Cash, cash equivalents, and restricted cash at end of period	$ 75.4	$ 169.0	$ 75.4	$ 169.0	$ 170.0

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