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2. Fair Value Investments (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	$ 178.2	$ 145.6
Current maturities of long-term debt, excluding leases	0	225.0
Total long-term debt, excluding capital leases and current maturities	718.7	718.2
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	261.6	205.6
Current maturities of long-term debt, excluding leases	0	228.1
Total long-term debt, excluding capital leases and current maturities	$ 754.3	$ 734.8

X

- Definition

Long Term Debt, Current Maturities, Excluding Capital Leases, Fair Value Disclosure

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
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- Definition

The fair value amount of long-term debt 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.

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Balance Type:	credit
Period Type:	instant

X

- Definition

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 element represents the fair value of assets categorized as other which are not in and of themselves material enough to require separate disclosure.

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