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Fair Value - Recurring Fair Value Measures (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Investments [Abstract] |  |  |  |  |  |  |  |
Cash Equivalents | $ 3.7 | [1] |  | $ 3.7 | [1] |  | $ 34.2 | [1]
Recurring Fair Value Measurements [Member] |  |  |  |  |  |  |  |
Investments [Abstract] |  |  |  |  |  |  |  |
Available-for-sale - Equity Securities | 8.3 | [2] |  | 8.3 | [2] |  | 7.9 | [2]
Available-for-sale - Corporate Debt Securities | 10.7 | [2] |  | 10.7 | [2] |  | 9.8 | [2]
Cash Equivalents | 3.7 | [2] |  | 3.7 | [2] |  | 34.2 | [2]
Total Fair Value of Assets | 22.7 |  |  | 22.7 |  |  | 51.9 |
Liabilities [Abstract] |  |  |  |  |  |  |  |
Deferred Compensation | 16.2 | [3] |  | 16.2 | [3] |  | 16.8 | [3]
Derivatives - Interest Rate Swap | 0.4 | [4] |  | 0.4 | [4] |  | 0.6 | [5]
Total Fair Value of Liabilities | 16.6 |  |  | 16.6 |  |  | 17.4 |
Total Net Fair Value of Assets (Liabilities) | 6.1 |  |  | 6.1 |  |  | 34.5 |
Fair Value Hierarchy Transfers, All Levels | 0 |  | 0 | 0 |  | 0 |  |
Recurring Fair Value Measurements [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Investments [Abstract] |  |  |  |  |  |  |  |
Available-for-sale - Equity Securities | 8.3 | [2] |  | 8.3 | [2] |  | 7.9 | [2]
Available-for-sale - Corporate Debt Securities | 0 | [2] |  | 0 | [2] |  | 0 | [2]
Cash Equivalents | 3.7 | [2] |  | 3.7 | [2] |  | 34.2 | [2]
Total Fair Value of Assets | 12.0 |  |  | 12.0 |  |  | 42.1 |
Liabilities [Abstract] |  |  |  |  |  |  |  |
Deferred Compensation | 0 | [3] |  | 0 | [3] |  | 0 | [3]
Derivatives - Interest Rate Swap | 0 | [4] |  | 0 | [4] |  | 0 | [5]
Total Fair Value of Liabilities | 0 |  |  | 0 |  |  | 0 |
Total Net Fair Value of Assets (Liabilities) | 12.0 |  |  | 12.0 |  |  | 42.1 |
Recurring Fair Value Measurements [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Investments [Abstract] |  |  |  |  |  |  |  |
Available-for-sale - Equity Securities | 0 | [2] |  | 0 | [2] |  | 0 | [2]
Available-for-sale - Corporate Debt Securities | 10.7 | [2] |  | 10.7 | [2] |  | 9.8 | [2]
Cash Equivalents | 0 | [2] |  | 0 | [2] |  | 0 | [2]
Total Fair Value of Assets | 10.7 |  |  | 10.7 |  |  | 9.8 |
Liabilities [Abstract] |  |  |  |  |  |  |  |
Deferred Compensation | 16.2 | [3] |  | 16.2 | [3] |  | 16.8 | [3]
Derivatives - Interest Rate Swap | 0.4 | [4] |  | 0.4 | [4] |  | 0.6 | [5]
Total Fair Value of Liabilities | 16.6 |  |  | 16.6 |  |  | 17.4 |
Total Net Fair Value of Assets (Liabilities) | (5.9) |  |  | (5.9) |  |  | (7.6) |
Recurring Fair Value Measurements [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Investments [Abstract] |  |  |  |  |  |  |  |
Available-for-sale - Equity Securities | 0 | [2] |  | 0 | [2] |  | 0 | [2]
Available-for-sale - Corporate Debt Securities | 0 | [2] |  | 0 | [2] |  | 0 | [2]
Cash Equivalents | 0 | [2] |  | 0 | [2] |  | 0 | [2]
Total Fair Value of Assets | 0 |  |  | 0 |  |  | 0 |
Liabilities [Abstract] |  |  |  |  |  |  |  |
Deferred Compensation | 0 | [3] |  | 0 | [3] |  | 0 | [3]
Derivatives - Interest Rate Swap | 0 | [4] |  | 0 | [4] |  | 0 | [5]
Total Fair Value of Liabilities | 0 |  |  | 0 |  |  | 0 |
Total Net Fair Value of Assets (Liabilities) | 0 |  |  | 0 |  |  | 0 |
Fair Value Activity in Level 3 | $ 0 |  | $ 0 | $ 0 |  | $ 0 |  |
[1] | During the first quarter of 2014, cash included in Other Investments was transferred to Cash and Cash Equivalents.
[2] | Included in Other Investments on the Consolidated Balance Sheet.
[3] | Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.
[4] | Included in Current Liabilities - Other on the Consolidated Balance Sheet.
[5] | Included in Current Liabilities - Other and Other Non-Current Liabilities on the Consolidated Balance Sheet.

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- Definition The amount of transfers in and out of levels 1, 2, and 3 of the fair value hierarchy during the period. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet Investments line item's cash and cash equivalents, valued at fair value by the entity. + References No definition available. + Details
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- Definition Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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- Definition Equity securities categorized neither as held-to-maturity nor trading which are intended be sold more than one year from the balance sheet date or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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