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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial Assets
Trading securities	$ 18.8	$ 13.6
Available-for-sale securities	116.7	115.3
Other investments	200.7	187.8
Fair value measured on a recurring basis | Fair value
Financial Assets
Cash equivalents	24.8	13.5
Trading securities	18.8	13.6
Available-for-sale securities	116.7	115.3
Other investments	156.4	155.4
Financial Liabilities
Contingent payment arrangements	40.5	31.0
Obligations to related parties	90.7	77.8
Interest rate derivatives	3.7	4.0
Fair value measured on a recurring basis | Level 1
Financial Assets
Cash equivalents	24.8	13.5
Trading securities	18.8	13.6
Available-for-sale securities	116.7	115.3
Other investments	13.4	15.7
Fair value measured on a recurring basis | Level 2
Financial Assets
Other investments	21.1	20.8
Financial Liabilities
Interest rate derivatives	3.7	4.0
Fair value measured on a recurring basis | Level 3
Financial Assets
Other investments	121.9	118.9
Financial Liabilities
Contingent payment arrangements	40.5	31.0
Obligations to related parties	$ 90.7	$ 77.8

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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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