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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Short-term debt [Member] |  |
Carrying amounts and fair values of Company's financial instruments |  |
Notional Amount | $ 3.9 | $ 9.0
Fair Value | 3.9 | 9.0
Long-term debt [Member] |  |
Carrying amounts and fair values of Company's financial instruments |  |
Notional Amount | 232.8 | 214.1
Fair Value | $ 232.8 | $ 212.4

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