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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Assets: |  |
Short-term investments | $ 11.7 | $ 7.5
Deferred compensation assets | 5.8 | 5.7
Foreign currency contracts | 0.1 |
Total assets at fair value | 17.6 | 13.2
Liabilities: |  |
Contingent consideration | 4.7 | 4.3
Deferred compensation liabilities | 10.3 | 12.1
Interest rate swap contracts | 5.1 | 5.6
Foreign currency contracts | 0.3 |
Total liabilities at fair value | 20.4 | 22.0
Level 1 [Member] |  |
Assets: |  |
Short-term investments | 11.7 | 7.5
Deferred compensation assets | 5.8 | 5.7
Total assets at fair value | 17.5 | 13.2
Liabilities: |  |
Deferred compensation liabilities | 10.3 | 12.1
Total liabilities at fair value | 10.3 | 12.1
Level 2 [Member] |  |
Assets: |  |
Foreign currency contracts | 0.1 |
Total assets at fair value | 0.1 |
Liabilities: |  |
Interest rate swap contracts | 5.1 | 5.6
Foreign currency contracts | 0.3 |
Total liabilities at fair value | 5.4 | 5.6
Level 3 [Member] |  |
Liabilities: |  |
Contingent consideration | 4.7 | 4.3
Total liabilities at fair value | $ 4.7 | $ 4.3

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