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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Financial Assets
Other investments	$ 175.0	$ 150.6
Fair value measured on a recurring basis | Fair value
Financial Assets
Cash equivalents	12.3	23.2
Trading securities	21.1	14.1
Available-for-sale securities	101.5	86.3
Other investments	157.0	145.3
Financial Liabilities
Contingent payment arrangements	83.1	87.1
Obligations to related parties	77.6	92.0
Interest rate derivatives	3.0	2.9
Fair value measured on a recurring basis | Level 1
Financial Assets
Cash equivalents	12.3	23.2
Trading securities	21.1	14.1
Available-for-sale securities	101.5	86.3
Other investments	34.5	31.1
Fair value measured on a recurring basis | Level 2
Financial Assets
Other investments	15.0	10.8
Financial Liabilities
Interest rate derivatives	3.0	2.9
Fair value measured on a recurring basis | Level 3
Financial Assets
Other investments	107.5	103.4
Financial Liabilities
Contingent payment arrangements	83.1	87.1
Obligations to related parties	$ 77.6	$ 92.0

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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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