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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2014
Fair Value [Abstract] |
Recurring Fair Value Measures [Table Text Block] |
| Fair Value as of December 31, 2013
Recurring Fair Value Measures | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Millions |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Investments (a) |  |  |  |  |  |  |
Available-for-sale – Equity Securities |  | $7.9 |  |  | — |  |  | — |  |  |  | $7.9 |
Available-for-sale – Corporate Debt Securities | — |  |  |  | $9.8 |  |  | — |  |  | 9.8 |
Cash Equivalents | 34.2 |  |  | — |  |  | — |  |  | 34.2 |
Total Fair Value of Assets |  | $42.1 |  |  |  | $9.8 |  |  | — |  |  |  | $51.9 |
Liabilities: |  |  |  |  |  |  |
Deferred Compensation (b) | — |  |  |  | $16.8 |  |  | — |  |  |  | $16.8 |
Derivatives – Interest Rate Swap (c) | — |  |  | 0.6 |  |  | — |  |  | 0.6 |
Total Fair Value of Liabilities | — |  |  |  | $17.4 |  |  | — |  |  |  | $17.4 |
Total Net Fair Value of Assets (Liabilities) |  | $42.1 |  |  | $(7.6) |  | — |  |  |  | $34.5 |
(a) | Included in Other Investments on the Consolidated Balance Sheet.
(b) | Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.
(c) | Included in Current Liabilities - Other and Other Non-Current Liabilities on the Consolidated Balance Sheet.
| Fair Value as of December 31, 2014
Recurring Fair Value Measures | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Millions |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Investments (a) |  |  |  |  |  |  |
Available-for-sale – Equity Securities |  | $8.1 |  |  | — |  |  | — |  |  |  | $8.1 |
Available-for-sale – Corporate Debt Securities | — |  |  |  | $10.8 |  |  | — |  |  | 10.8 |
Cash Equivalents | 2.9 |  |  | — |  |  | — |  |  | 2.9 |
Total Fair Value of Assets |  | $11.0 |  |  |  | $10.8 |  |  | — |  |  |  | $21.8 |
Liabilities: |  |  |  |  |  |  |
Deferred Compensation (b) | — |  |  |  | $16.2 |  |  | — |  |  |  | $16.2 |
Derivatives – Interest Rate Swap (c) | — |  |  | 0.3 |  |  | — |  |  | 0.3 |
Total Fair Value of Liabilities | — |  |  |  | $16.5 |  |  | — |  |  |  | $16.5 |
Total Net Fair Value of Assets (Liabilities) |  | $11.0 |  |  | $(5.7) |  | — |  |  |  | $5.3 |
(a) | Included in Other Investments on the Consolidated Balance Sheet.
(b) | Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.
(c) | Included in Current Liabilities - Other on the Consolidated Balance Sheet.
Financial Instruments [Table Text Block] |
Financial Instruments | Carrying Amount |  | Fair Value
Millions |  |  |
Long-Term Debt, Including Current Portion |  |  |
December 31, 2014 | $1,373.5 |  | $1,484.5
December 31, 2013 | $1,110.2 |  | $1,131.7

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + 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 (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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