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Fair Value Measurements - Summary of Assets and Liabilities at Fair Value (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Financial Assets |  |  |  |  |
Trading securities | $ 23.0 |  |  | $ 22.5 |
Available-for-sale securities | 113.0 |  |  | 135.4 |
Other investments | 220.7 |  |  | 214.1 |
Financial Liabilities |  |  |  |  |
Collateral posted | 3.3 |  |  | 3.6 |
Gain on interest rate swap | 0.3 |  | 0.3 |  |
Fair value measured on a recurring basis [Member] | Fair value [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Cash equivalents | 37.7 |  |  | 39.0 |
Trading securities | 23.0 | [1] |  | 22.5 | [1]
Available-for-sale securities | 113.0 | [1] |  | 135.4 | [1]
Other investments | 169.7 |  |  | 164.3 |
Financial Liabilities |  |  |  |  |
Contingent payment arrangements | 53.2 | [2] |  | 50.2 | [2]
Obligations to related parties | 131.9 | [2] |  | 76.9 | [2]
Interest rate derivatives | 2.2 | [3] |  | 2.5 | [3]
Fair value measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Cash equivalents | 37.7 |  |  | 39.0 |
Trading securities | 23.0 | [1] |  | 22.5 | [1]
Available-for-sale securities | 113.0 | [1] |  | 135.4 | [1]
Other investments | 14.6 |  |  | 14.1 |
Financial Liabilities |  |  |  |  |
Contingent payment arrangements | 0 | [2] |  | 0 | [2]
Obligations to related parties | 0 | [2] |  | 0 | [2]
Interest rate derivatives | 0 | [3] |  | 0 | [3]
Fair value measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |
Trading securities | 0 | [1] |  | 0 | [1]
Available-for-sale securities | 0 | [1] |  | 0 | [1]
Other investments | 19.2 |  |  | 18.4 |
Financial Liabilities |  |  |  |  |
Contingent payment arrangements | 0 | [2] |  | 0 | [2]
Obligations to related parties | 0 | [2] |  | 0 | [2]
Interest rate derivatives | 2.2 | [3] |  | 2.5 | [3]
Fair value measured on a recurring basis [Member] | Significant Other Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |
Trading securities | 0 | [1] |  | 0 | [1]
Available-for-sale securities | 0 | [1] |  | 0 | [1]
Other investments | 135.9 |  |  | 131.8 |
Financial Liabilities |  |  |  |  |
Contingent payment arrangements | 53.2 | [2] |  | 50.2 | [2]
Obligations to related parties | 131.9 | [2] |  | 76.9 | [2]
Interest rate derivatives | $ 0 | [3] |  | $ 0 | [3]
[1] | Principally investments in equity securities.
[2] | Amounts are presented within Other liabilities in the accompanying Consolidated Balance Sheets.
[3] | The fair value of the Company's interest rate swaps are presented within Other liabilities in the accompanying Consolidated Balance Sheets. As of December 31, 2013 and March 31, 2014, the Company had posted collateral with its counterparties of $3.6 million and $3.3 million, respectively. For the three months ended March 31, 2013 and 2014, gains on these interest rate swaps ($0.3 million and $0.3 million, respectively) have been reported in the Consolidated Statements of Comprehensive Income.

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- Definition Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=SL6742756-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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