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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cash equivalents	$ 106.0	$ 5.9
Three Point Seven Five Percent Senior Unsecured Notes Due September First, Twenty Sixteen [Member] \| Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of long-term debt	$ 258.2

Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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