Income Taxes Schedule of Deferred Tax Asset and Liability (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Income Tax Assets:
Provision for expenses and losses	$ 31.3	$ 35.4
Postretirement and other employee benefits	9.9	12.7
Tax credit and loss carryforwards	14.6	13.7
Other	0.1us-gaap_DeferredTaxAssetsOther	1.9us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets	55.9us-gaap_DeferredTaxAssetsGross	63.7us-gaap_DeferredTaxAssetsGross
Valuation allowance	(10.1)	(8.0)
Deferred income tax assets, net	45.8us-gaap_DeferredTaxAssetsLiabilitiesNet	55.7us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred Income Tax Liabilities:
Property, equipment and intangible assets	(309.3)	(340.5)
Other	(0.5)us-gaap_DeferredTaxLiabilitiesOther	0us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities	(309.8)us-gaap_DeferredIncomeTaxLiabilities	(340.5)us-gaap_DeferredIncomeTaxLiabilities
Deferred income tax liabilities, net	$ (264.0)us-gaap_DeferredTaxLiabilities	$ (284.8)us-gaap_DeferredTaxLiabilities

Deferred Tax Liabilities, Property, Equipment, and Intangible Assets

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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