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Long-term debt (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Debt Instrument, Term	2 years
Term loan agreement	$ 125.0
Long-term commercial paper	$ 283.5	$ 153.9

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer).

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