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Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Current Assets [Abstract]
Prepaid expenses	$ 49.3	$ 46.0
Fair value of derivative assets	4.5	5.9
Other	5.6	3.6
Total other current assets	$ 59.4	$ 55.5

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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