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Guarantees (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Guarantor Obligations [Line Items]
Letters of Credit Outstanding, Amount	$ 113.4
Performance Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	36.1
Indemnification Agreement [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	410.0
Guarantee Type, Other [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	16.9
Cash and Cash Equivalents [Member]
Guarantor Obligations [Line Items]
Pledged Assets, Not Separately Reported, Other	$ 15.4

The carrying amount, as of the date of the latest financial statement presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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