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Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Amount outstanding	$ 162.8	$ 102.8
Remaining maturity (in days)	4 days
Weighted average interest rate	0.50%
Long-Term Debt [Member]
Debt Instrument [Line Items]
Amount outstanding	$ 50.0

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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