v2.4.0.6

Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Liabilities:
Fair value of fuel and commodity hedges included in other accrued liabilities	$ 1.8	$ 1.6
Fair Value, Measurements, Recurring [Member]
Assets:
Total assets	109.9	107.0
Liabilities:
Total liabilities	1.8	1.6
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Total assets	62.3	62.8
Liabilities:
Total liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total assets	47.6	44.2
Liabilities:
Total liabilities	1.8	1.6
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Total assets	0	0
Liabilities:
Total liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Commodity hedges [Member]
Assets:
Other current assets	0.4	1.0
Liabilities:
Fair value of fuel and commodity hedges included in other accrued liabilities	1.7	1.2
Fair Value, Measurements, Recurring [Member] | Commodity hedges [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Other current assets	0	0
Liabilities:
Fair value of fuel and commodity hedges included in other accrued liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Commodity hedges [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Other current assets	0.4	1.0
Liabilities:
Fair value of fuel and commodity hedges included in other accrued liabilities	1.7	1.2
Fair Value, Measurements, Recurring [Member] | Commodity hedges [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Other current assets	0	0
Liabilities:
Fair value of fuel and commodity hedges included in other accrued liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fuel hedges [Member]
Assets:
Other current assets	5.0	3.1
Liabilities:
Fair value of fuel and commodity hedges included in other accrued liabilities	0.1	0.4
Fair Value, Measurements, Recurring [Member] | Fuel hedges [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Other current assets	0	0
Liabilities:
Fair value of fuel and commodity hedges included in other accrued liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fuel hedges [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Other current assets	5.0	3.1
Liabilities:
Fair value of fuel and commodity hedges included in other accrued liabilities	0.1	0.4
Fair Value, Measurements, Recurring [Member] | Fuel hedges [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Other current assets	0	0
Liabilities:
Fair value of fuel and commodity hedges included in other accrued liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Money market mutual funds [Member]
Assets:
Available-for-sale securities	62.3	62.8
Fair Value, Measurements, Recurring [Member] | Money market mutual funds [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Available-for-sale securities	62.3	62.8
Fair Value, Measurements, Recurring [Member] | Money market mutual funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Money market mutual funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Bonds [Member]
Assets:
Available-for-sale securities	42.2	40.1
Fair Value, Measurements, Recurring [Member] | Bonds [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Available-for-sale securities	42.2	40.1
Fair Value, Measurements, Recurring [Member] | Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Available-for-sale securities	$ 0	$ 0

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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-Publisher FASB

-Name Accounting Standards Codification

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