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Fair Value Measurements (Fair Value of Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Short-term investments | $ 7.5 | $ 12.4
Deferred compensation assets | 5.7 | 4.0
Total assets at fair value | 13.2 | 16.4
Liabilities: |  |
Contingent consideration | 4.3 | 3.3
Deferred compensation liabilities | 12.1 | 7.6
Interest rate swap contracts | 5.6 | 8.6
Foreign currency contracts |  | 1.4
Total liabilities at fair value | 22.0 | 20.9
Other Financial Instruments [Abstract] |  |
Long-term debt, fair value | 365.8 | 386.0
Long-term debt | 371.3 | 378.8
Level 1 [Member] |  |
Assets: |  |
Short-term investments | 7.5 | 12.4
Deferred compensation assets | 5.7 | 4.0
Total assets at fair value | 13.2 | 16.4
Liabilities: |  |
Deferred compensation liabilities | 12.1 | 7.6
Total liabilities at fair value | 12.1 | 7.6
Level 2 [Member] |  |
Liabilities: |  |
Interest rate swap contracts | 5.6 | 8.6
Foreign currency contracts |  | 1.4
Total liabilities at fair value | 5.6 | 10.0
Level 3 [Member] |  |
Liabilities: |  |
Contingent consideration | 4.3 | 3.3
Total liabilities at fair value | $ 4.3 | $ 3.3

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