Income Taxes (Deferred tax liabilities and assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Depreciation	$ 259.6	$ 295.2
Deferred revenue	14.7	17.2
Intangibles	22.3	29.5
Gain on debt redemption	51.3	64.3
Other	87.0us-gaap_DeferredTaxLiabilitiesOther	54.7us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities	434.9us-gaap_DeferredIncomeTaxLiabilities	460.9us-gaap_DeferredIncomeTaxLiabilities
Claims and insurance	(168.8)	(169.2)
Net operating loss carryforwards	(316.4)	(329.1)
Employee benefit accruals	(273.8)	(237.9)
Other	(169.0)us-gaap_DeferredTaxAssetsOther	(176.7)us-gaap_DeferredTaxAssetsOther
Deferred tax assets	(928.0)us-gaap_DeferredTaxAssetsGross	(912.9)us-gaap_DeferredTaxAssetsGross
Valuation allowance	494.5	454.1
Net deferred tax assets	(433.5)us-gaap_DeferredTaxAssetsNet	(458.8)us-gaap_DeferredTaxAssetsNet
Net deferred tax liability	$ 1.4us-gaap_DeferredTaxLiabilities	$ 2.1us-gaap_DeferredTaxLiabilities

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 and carryforwards.

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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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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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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Deferred Tax Assets, Claims And Insurance

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Deferred Tax Liabilities, Gain On Debt Redemption

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