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Guarantor Subsidiaries (Consolidating Statement Of Cash Flow) (Details) - 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
(Gain) loss on sale of assets 0.5 0.0 0.7 3.4  
Net (increase) decrease in noncash operating working capital     (15.8) (58.3)  
Equity in earnings of affiliates 0.0 0.0 0.0 0.0  
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 distributions to parent     0.0 0.0  
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
Eliminations          
Operating Activities          
Net income (loss) (45.0) (67.9) (136.0) (120.4)  
Adjustments to reconcile net income (loss) to net cash provided by operating activities          
Depreciation and amortization 0.0 0.0 0.0 0.0  
Deferred and noncurrent income tax charges (credits)     0.0 0.0  
Accretion of asset retirement obligations 0.0 0.0 0.0 0.0  
(Gain) loss on sale of assets 0.0 0.0 0.0 0.0  
Net (increase) decrease in noncash operating working capital     0.0 0.0  
Equity in earnings of affiliates 45.0 67.9 136.0 120.4  
Other operating activities - net     0.0 0.0  
Net cash provided by (required by) operating activities     0.0 0.0  
Investing Activities          
Property additions     0.0 0.0  
Proceeds from sale of assets     0.0 0.0  
Other investing activities - net     0.0 0.0  
Net cash provided by (required by) investing activities     0.0 0.0  
Financing Activities          
Purchase of treasury stock     0.0 0.0  
Borrowings of debt     0.0 0.0  
Repayments of debt     0.0 0.0  
Debt issuance costs     0.0 0.0  
Amounts related to share-based compensation     0.0 0.0  
Net distributions to parent     0.0 0.0  
Net cash provided by (required by) financing activities     0.0 0.0  
Net increase (decrease) in cash and cash equivalents     0.0 0.0  
Cash and cash equivalents at beginning of period     0.0 0.0 0.0
Restricted cash at beginning of period     0.0 0.0 0.0
Cash, cash equivalents, and restricted cash at beginning of period     0.0 0.0 0.0
Cash and cash equivalents at end of period 0.0 0.0 0.0 0.0 0.0
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 0.0 0.0 0.0 0.0 0.0
Parent Company | Reportable Legal Entities          
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 0.0 0.0 0.0 0.0  
Deferred and noncurrent income tax charges (credits)     0.0 0.0  
Accretion of asset retirement obligations 0.0 0.0 0.0 0.0  
(Gain) loss on sale of assets 0.0 0.0 0.0 0.0  
Net (increase) decrease in noncash operating working capital     0.0 0.0  
Equity in earnings of affiliates (45.0) (67.9) (136.1) (120.4)  
Other operating activities - net     0.0 0.0  
Net cash provided by (required by) operating activities     0.0 0.0  
Investing Activities          
Property additions     0.0 0.0  
Proceeds from sale of assets     0.0 0.0  
Other investing activities - net     0.0 0.0  
Net cash provided by (required by) investing activities     0.0 0.0  
Financing Activities          
Purchase of treasury stock     (144.4) (152.0)  
Borrowings of debt     0.0 0.0  
Repayments of debt     0.0 0.0  
Debt issuance costs     0.0 0.0  
Amounts related to share-based compensation     0.0 0.0  
Net distributions to parent     144.4 152.0  
Net cash provided by (required by) financing activities     0.0 0.0  
Net increase (decrease) in cash and cash equivalents     0.0 0.0  
Cash and cash equivalents at beginning of period     0.0 0.0 0.0
Restricted cash at beginning of period     0.0 0.0 0.0
Cash, cash equivalents, and restricted cash at beginning of period     0.0 0.0 0.0
Cash and cash equivalents at end of period 0.0 0.0 0.0 0.0 0.0
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 0.0 0.0 0.0 0.0 0.0
Issuer | Reportable Legal Entities          
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  
(Gain) loss on sale of assets 0.5 0.0 0.7 3.4  
Net (increase) decrease in noncash operating working capital     (15.8) (58.3)  
Equity in earnings of affiliates 0.0 0.0 0.1 0.0  
Other operating activities - net     6.0 (1.4)  
Net cash provided by (required by) operating activities     241.5 166.3  
Investing Activities          
Property additions     (162.2) (200.7)  
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     (166.9) (204.6)  
Financing Activities          
Purchase of treasury stock     0.0 0.0  
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 distributions to parent     (145.9) (152.8)  
Net cash provided by (required by) financing activities     (169.8) 53.5  
Net increase (decrease) in cash and cash equivalents     (95.2) 15.2  
Cash and cash equivalents at beginning of period     169.9 153.8 153.8
Restricted cash at beginning of period     0.0 0.0 0.0
Cash, cash equivalents, and restricted cash at beginning of period     169.9 153.8 153.8
Cash and cash equivalents at end of period 74.7 169.0 74.7 169.0 169.9
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 74.7 169.0 74.7 169.0 169.9
Guarantor Subsidiaries | Reportable Legal Entities          
Operating Activities          
Net income (loss) 0.0 0.0 (0.1) 0.0  
Adjustments to reconcile net income (loss) to net cash provided by operating activities          
Depreciation and amortization 0.0 0.0 0.0 0.0  
Deferred and noncurrent income tax charges (credits)     0.0 0.0  
Accretion of asset retirement obligations 0.0 0.0 0.0 0.0  
(Gain) loss on sale of assets 0.0 0.0 0.0 0.0  
Net (increase) decrease in noncash operating working capital     0.0 0.0  
Equity in earnings of affiliates 0.0 0.0 0.0 0.0  
Other operating activities - net     0.0 0.0  
Net cash provided by (required by) operating activities     (0.1) 0.0  
Investing Activities          
Property additions     (0.8) (0.8)  
Proceeds from sale of assets     0.0 0.0  
Other investing activities - net     0.0 0.0  
Net cash provided by (required by) investing activities     (0.8) (0.8)  
Financing Activities          
Purchase of treasury stock     0.0 0.0  
Borrowings of debt     0.0 0.0  
Repayments of debt     0.0 0.0  
Debt issuance costs     0.0 0.0  
Amounts related to share-based compensation     0.0 0.0  
Net distributions to parent     1.5 0.8  
Net cash provided by (required by) financing activities     1.5 0.8  
Net increase (decrease) in cash and cash equivalents     0.6 0.0  
Cash and cash equivalents at beginning of period     0.1 0.0 0.0
Restricted cash at beginning of period     0.0 0.0 0.0
Cash, cash equivalents, and restricted cash at beginning of period     0.1 0.0 0.0
Cash and cash equivalents at end of period 0.7 0.0 0.7 0.0 0.1
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 0.7 0.0 0.7 0.0 0.1
Non-Guarantor Subsidiaries | Reportable Legal Entities          
Operating Activities          
Net income (loss) 0.0 0.0 0.0 0.0  
Adjustments to reconcile net income (loss) to net cash provided by operating activities          
Depreciation and amortization 0.0 0.0 0.0 0.0  
Deferred and noncurrent income tax charges (credits)     0.0 0.0  
Accretion of asset retirement obligations 0.0 0.0 0.0 0.0  
(Gain) loss on sale of assets 0.0 0.0 0.0 0.0  
Net (increase) decrease in noncash operating working capital     0.0 0.0  
Equity in earnings of affiliates 0.0 0.0 0.0 0.0  
Other operating activities - net     0.0 0.0  
Net cash provided by (required by) operating activities     0.0 0.0  
Investing Activities          
Property additions     0.0 0.0  
Proceeds from sale of assets     0.0 0.0  
Other investing activities - net     0.0 0.0  
Net cash provided by (required by) investing activities     0.0 0.0  
Financing Activities          
Purchase of treasury stock     0.0 0.0  
Borrowings of debt     0.0 0.0  
Repayments of debt     0.0 0.0  
Debt issuance costs     0.0 0.0  
Amounts related to share-based compensation     0.0 0.0  
Net distributions to parent     0.0 0.0  
Net cash provided by (required by) financing activities     0.0 0.0  
Net increase (decrease) in cash and cash equivalents     0.0 0.0  
Cash and cash equivalents at beginning of period     0.0 0.0 0.0
Restricted cash at beginning of period     0.0 0.0 0.0
Cash, cash equivalents, and restricted cash at beginning of period     0.0 0.0 0.0
Cash and cash equivalents at end of period 0.0 0.0 0.0 0.0 0.0
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 $ 0.0 $ 0.0 $ 0.0 $ 0.0 $ 0.0