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Fair Value (Details) (USD $) In Millions |  |  |  |  |  |  |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  |  |
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Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2011 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Jun. 30, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Jun. 30, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Jun. 30, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] | Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure [Member] | Jun. 30, 2010 Derivative Financial Instruments, Assets [Member] | Dec. 31, 2009 Derivative Financial Instruments, Assets [Member] | Jun. 30, 2011 Debt Securities Issued by States of the United States[Member] | Dec. 31, 2010 Debt Securities Issued by States of the United States[Member] | Jun. 30, 2010 Debt Securities Issued by States of the United States[Member] | Dec. 31, 2009 Debt Securities Issued by States of the United States[Member]
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities |  |  | $ 21.4 | $ 19.4 | $ 21.4 | $ 19.4 |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Debt Securities |  |  | 8.0 | 7.5 |  |  | 8.0 | 7.5 |  |  |  |  |  |  |  |  |
Debt Securities Issued by States of the United States (ARS) |  |  |  | 6.7 |  |  |  |  | 6.7 |  |  |  |  |  |  |  |
Total Available-for-sale Securities |  |  | 8.0 | 14.2 |  |  | 8.0 | 7.5 | 6.7 |  |  |  |  |  |  |  |
Money Market Funds |  |  | 3.6 | 0.8 | 3.6 | 0.8 |  |  |  |  |  |  |  |  |  |  |
Total Fair Value of Assets |  |  | 33.0 | 34.4 | 25.0 | 20.2 | 8.0 | 7.5 | 6.7 |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  | 14.6 | 13.3 |  |  | 14.6 | 13.3 |  |  |  |  |  |  |  |  |
Total Fair Value of Liabilities |  |  | 14.6 | 13.3 |  |  | 14.6 | 13.3 |  |  |  |  |  |  |  |  |
Total Net Fair Value of Assets (Liabilities) |  |  | 18.4 | 21.1 | 25.0 | 20.2 | (6.6) | (5.8) | 6.7 |  |  |  |  |  |  |  |
Activity in Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Level 3 Assets Measured on a Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  | 0.7 |  | 6.7 | 6.7 | 6.7
Redeemed During the Period |  |  |  |  |  |  |  |  |  |  |  | (0.7) |  | (6.7) |  |  |
Fair Value of Fianancial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Including Current Portion | $ 783.6 | $ 785.0 |  |  |  |  |  |  |  | $ 807.8 | $ 796.7 |  |  |  |  |  |

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- Definition Total of debt securities issued by states of the United States categorized as neither held-to-maturity nor trading. + Details
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- Definition This element represents the aggregate of the assets and liabilities 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. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + Details
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- 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 item represents investments accounted for under the equity method of accounting as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6903542&loc=d3e32014-111567 + Details
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- Definition Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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