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Level 4 Income Taxes (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Feb. 04, 2013
Income Taxes [Line Items]            
Deferred tax assets, gross           $ 101,900,000
Deferred tax liabilities, gross           33,200,000
Deferred tax assets, pensions           69,800,000
Deferred tax liabilities, property and equipment           27,400,000
Deferred tax assets, other employee benefits           18,000,000
Income Taxes Paid, Net     17,800,000 200,000    
Income Tax Rate Reconciliation [Abstract]            
Income before income taxes 25,462,000 23,607,000 62,400,000 40,461,000    
Statutory U.S. income tax rate     35.00%      
Statutory tax provision     21,840,000      
State taxes     2,013,000      
Other     105,000      
Effective income tax rate 37.70%   (71.60%)   1.00%  
Recognition of beginning deferred tax balances     (68,666,000)      
Income tax provision (benefit) 9,602,000 104,000 (44,708,000) [1] 243,000    
Current income tax provision (benefit) [Abstract]            
Federal     17,516,000      
State     2,849,000      
Foreign     22,000      
Total current     20,387,000      
Deferred income tax provision (benefit) [Abstract]            
Federal     (59,648,000)      
State     (5,447,000)      
Foreign     0      
Total deferred     (65,095,000) 0    
Income tax provision (benefit) 9,602,000 104,000 (44,708,000) [1] 243,000    
Income tax expense, excluding discrete items [Member]
            
Income Tax Rate Reconciliation [Abstract]            
Effective income tax rate     38.40%      
Income tax provision (benefit)     23,958,000      
Deferred income tax provision (benefit) [Abstract]            
Income tax provision (benefit)     23,958,000      
Capital loss carryforward [Member]
            
Income Taxes [Line Items]            
Capital loss carryforwards, valuation allowance $ 6,100,000   $ 6,100,000      
[1] EBITDA is defined as income (loss) before interest (interest expense and interest income), income taxes, and depreciation and amortization. EBITDA is the primary measure used by our chief operating decision maker to evaluate segment operating performance and to decide how to allocate resources to segments. We believe EBITDA is useful to investors because it provides a means to evaluate the operating performance of our segments and our company on an ongoing basis using criteria that are used by our internal decision makers and because it is frequently used by investors and other interested parties when comparing companies in our industry that have different financing and capital structures and/or tax rates. We believe EBITDA is a meaningful measure because it presents a transparent view of our recurring operating performance and allows management to readily view operating trends, perform analytical comparisons, and identify strategies to improve operating performance. EBITDA, however, is not a measure of our liquidity or financial performance under generally accepted accounting principles (GAAP) and should not be considered as an alternative to net income (loss), income (loss) from operations, or any other performance measure derived in accordance with GAAP or as an alternative to cash flow from operating activities as a measure of our liquidity. The use of EBITDA instead of net income (loss) or segment income (loss) has limitations as an analytical tool, including the inability to determine profitability; the exclusion of interest expense, interest income, and associated significant cash requirements; and the exclusion of depreciation and amortization, which represent unavoidable operating costs. Management compensates for the limitations of EBITDA by relying on our GAAP results. Our measure of EBITDA is not necessarily comparable to other similarly titled captions of other companies due to potential inconsistencies in the methods of calculation.The following is a reconciliation of net income to EBITDA: Three Months EndedSeptember 30 Nine Months EndedSeptember 30 2013 2012 2013 2012 (millions)Net income(1) $15.9 $23.5 $107.1 $40.2Interest expense 5.2 4.8 14.8 14.5Interest income (0.1) (0.1) (0.2) (0.3)Income tax provision (benefit)(1) 9.6 0.1 (44.7) 0.2Depreciation and amortization 9.0 8.5 26.2 24.9EBITDA $39.5 $36.8 $103.2 $79.6 _______________________________________ (1)The nine months ended September 30, 2013, includes $68.7 million of income tax benefit associated with the recording of net deferred tax assets upon our conversion to a corporation.