Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Classification) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current assets	$ 67.4us-gaap_DeferredTaxAssetsNetCurrent	$ 58.9us-gaap_DeferredTaxAssetsNetCurrent
Noncurrent assets (included in other noncurrent assets)	9.5us-gaap_DeferredTaxAssetsNetNoncurrent	10.5us-gaap_DeferredTaxAssetsNetNoncurrent
Total deferred income tax assets	76.9us-gaap_DeferredTaxAssetsNet	69.4us-gaap_DeferredTaxAssetsNet
Current liabilities (included in accounts payable and accrued liabilities)	(3.7)us-gaap_DeferredTaxLiabilitiesCurrent	(2.1)us-gaap_DeferredTaxLiabilitiesCurrent
Noncurrent liabilities	(874.4)	(823.6)
Net deferred income tax liability	$ (801.2)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (756.3)us-gaap_DeferredTaxAssetsLiabilitiesNet

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

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-Publisher FASB

-Name Accounting Standards Codification

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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 after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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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 net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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