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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis | The following tables summarize the Company’s financial assets and liabilities that are measured at fair value on a recurring basis:
|  |  | Fair Value Measurements
| December 31, 2017 |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Financial Assets |  |  |  |  |  |  |
Cash equivalents | $ | 40.4 |  |  | $ | 40.4 |  |  | $ | — |  |  | $ | — |
Investments in marketable securities | 77.8 |  |  | 77.8 |  |  | — |  |  | — |
Derivative financial instruments(1) | 0.2 |  |  | — |  |  | 0.2 |  |  | — |
Financial Liabilities(2) |  |  |  |  |  |  |
Contingent payment arrangements | $ | 9.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 9.4 |
Affiliate equity repurchase obligations | 49.2 |  |  | — |  |  | — |  |  | 49.2 |
Derivative financial instruments | 0.6 |  |  | — |  |  | 0.6 |  |  | — |
|  |  | Fair Value Measurements
| September 30, 2018 |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Financial Assets |  |  |  |  |  |  |
Cash equivalents | $ | 48.1 |  |  | $ | 48.1 |  |  | $ | — |  |  | $ | — |
Investments in marketable securities | 144.1 |  |  | 144.1 |  |  | — |  |  | — |
Derivative financial instruments(1) | 1.0 |  |  | — |  |  | 1.0 |  |  | — |
Financial Liabilities(2) |  |  |  |  |  |  |
Contingent payment arrangements | $ | 4.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 4.3 |
Affiliate equity repurchase obligations | 28.7 |  |  | — |  |  | — |  |  | 28.7 |
Derivative financial instruments | 4.5 |  |  | — |  |  | 4.5 |  |  | — |
__________________________
(1) | Amounts are presented within Other investments and assets.
(2) | Amounts are presented within Other liabilities.
Schedule of Changes in Level 3 Assets and Liabilities | The following tables present the changes in level 3 liabilities:
| For the Three Months Ended September 30,
| 2017 | 2018
| Contingent Payment Arrangements |  | Affiliate Equity Repurchase Obligations |  | Contingent Payment Arrangements |  | Affiliate Equity Repurchase Obligations
Balance, beginning of period | $ | 7.8 |  |  | $ | 70.7 |  |  | $ | 4.2 |  |  | $ | 36.9 |
Net realized and unrealized (gains) losses(1) | 0.3 |  |  | (0.2 | ) |  | 0.1 |  |  | — |
Purchases and issuances(2) | — |  |  | 11.1 |  |  | — |  |  | 40.1 |
Settlements and reductions | — |  |  | (35.9 | ) |  | — |  |  | (48.3 | )
Balance, end of period | $ | 8.1 |  |  | $ | 45.7 |  |  | $ | 4.3 |  |  | $ | 28.7 |
Net change in unrealized (gains) losses relating to instruments still held at the reporting date(1) | $ | 0.3 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |
| For the Nine Months Ended September 30,
| 2017 |  | 2018
| Contingent Payment Arrangements |  | Affiliate Equity Repurchase Obligations |  | Contingent Payment Arrangements |  | Affiliate Equity Repurchase Obligations
Balance, beginning of period | $ | 8.6 |  |  | $ | 12.1 |  |  | $ | 9.4 |  |  | $ | 49.2 |
Net realized and unrealized (gains) losses(1) | 2.3 |  |  | (0.2 | ) |  | (0.3 | ) |  | — |
Purchases and issuances(2) | — |  |  | 161.5 |  |  | — |  |  | 86.0 |
Settlements and reductions | (2.8 | ) |  | (127.7 | ) |  | (4.8 | ) |  | (106.5 | )
Balance, end of period | $ | 8.1 |  |  | $ | 45.7 |  |  | $ | 4.3 |  |  | $ | 28.7 |
Net change in unrealized (gains) losses relating to instruments still held at the reporting date(1) | $ | 2.3 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | — |
___________________________
(1) | Accretion and changes in the expected value of the Company’s contingent payment arrangements and Affiliate equity repurchase obligations are recorded in Other expenses (net) in the Consolidated Statements of Income.
(2) | Includes transfers from Redeemable non-controlling interests.
Schedule of Quantitative Information used in Valuing Level 3 Liabilities | The following table presents certain quantitative information about the significant unobservable inputs used in valuing the Company’s level 3 fair value measurements:
| Quantitative Information About Level 3 Fair Value Measurements
| Valuation Techniques |  | Unobservable Input |  | Fair Value at December 31, 2017 |  | Range at December 31, 2017 |  | Fair Value at September 30, 2018 |  | Range at September 30, 2018
Contingent payment arrangements | Discounted cash flow |  | Growth rates |  | $ | 9.4 |  |  | 7% - 8% |  | $ | 4.3 |  |  | 7%
|  |  | Discount rates |  |  |  |  | 15% - 16% |  |  |  |  | 15%
Affiliate equity repurchase obligations | Discounted cash flow |  | Growth rates |  | 49.2 |  |  | 0% - 11% |  | 28.7 |  |  | 4% - 9%
|  |  | Discount rates |  |  |  |  | 12% - 16% |  |  |  |  | 14% - 16%
Schedule of Investments in Certain Entities that Calculate Net Asset Value | The following table summarizes the nature of the Company’s investments, unfunded commitments and any related liquidity restrictions or other factors that may impact the ultimate value realized:
| December 31, 2017 |  | September 30, 2018
Category of Investment | Fair Value |  | Unfunded Commitments |  | Fair Value |  | Unfunded Commitments
Private equity funds(1) | $ | 156.1 |  |  | $ | 98.8 |  |  | $ | 185.4 |  |  | $ | 130.4 |
Other funds(2) | 8.9 |  |  | — |  |  | 7.4 |  |  | — |
Other investments(3) | $ | 165.0 |  |  | $ | 98.8 |  |  | $ | 192.8 |  |  | $ | 130.4 |
___________________________
(1) | The Company uses NAV as a practical expedient one quarter in arrears (adjusted for current period calls and distributions) to determine the fair value. These funds primarily invest in a broad range of private equity funds, as well as making direct investments. Distributions will be received as the underlying assets are liquidated over the life of the funds, which is generally up to 15 years.
(2) | These are multi-disciplinary funds that invest across various asset classes and strategies, including long/short equity, credit and real estate. Investments are generally redeemable on a daily, monthly or quarterly basis.
(3) | Fair value attributable to the controlling interest was $80.1 million and $115.0 million as of December 31, 2017 and September 30, 2018, respectively.
Schedule of Financial Assets and Liabilities Not Carried at Fair Value | The following table summarizes the Company’s other financial liabilities not carried at fair value:
| December 31, 2017 |  | September 30, 2018 |  |
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |  | Fair Value Hierarchy
Senior notes(1) | $ | 745.7 |  |  | $ | 765.2 |  |  | $ | 746.1 |  |  | $ | 743.8 |  |  | Level 2
Convertible securities | 309.9 |  |  | 549.8 |  |  | 311.8 |  |  | 498.7 |  |  | Level 2
___________________________
(1) | The carrying value of the senior notes is reported in Senior debt.

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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