Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions | 6 Months Ended | |
Jun. 30, 2015 | Dec. 31, 2014 |
Assets of consolidated Funds | | |
Total fair value assets | $ 100.8 | $ 259.3 |
Quoted prices in active markets (Level I) | | |
Assets of consolidated Funds | | |
Total fair value assets | 66.4 | 190.5 |
Significant other observable inputs (Level II) | | |
Assets of consolidated Funds | | |
Total fair value assets | 0 | 34.3 |
Significant unobservable inputs (Level III) | | |
Assets of consolidated Funds | | |
Total fair value assets | 34.4 | 34.5 |
Consolidated Funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | 0 | 60.6 |
Restricted cash held at fair value | | 104.5 |
Total fair value assets | | 165.1 |
Liabilities of consolidated Funds | | |
Total fair value liabilities | | (16.4) |
Consolidated Funds | Common stock | | |
Liabilities of consolidated Funds | | |
Total fair value liabilities | 0 | (16.4) |
Consolidated Funds | Common and preferred stock | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 24.8 |
Consolidated Funds | Short-term investment funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0.1 |
Consolidated Funds | Fixed income securities | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 1.1 |
Consolidated Funds | Collective investment Funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 32.5 |
Consolidated Funds | Other Investments | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 2.1 |
Consolidated Funds | Quoted prices in active markets (Level I) | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 26.3 |
Restricted cash held at fair value | | 104.5 |
Total fair value assets | | 130.8 |
Liabilities of consolidated Funds | | |
Total fair value liabilities | | (16.4) |
Consolidated Funds | Quoted prices in active markets (Level I) | Common stock | | |
Liabilities of consolidated Funds | | |
Total fair value liabilities | | (16.4) |
Consolidated Funds | Quoted prices in active markets (Level I) | Common and preferred stock | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 24.8 |
Consolidated Funds | Quoted prices in active markets (Level I) | Short-term investment funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0.1 |
Consolidated Funds | Quoted prices in active markets (Level I) | Fixed income securities | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 1.1 |
Consolidated Funds | Quoted prices in active markets (Level I) | Collective investment Funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Consolidated Funds | Quoted prices in active markets (Level I) | Other Investments | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0.3 |
Consolidated Funds | Significant other observable inputs (Level II) | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 34.3 |
Restricted cash held at fair value | | 0 |
Total fair value assets | | 34.3 |
Liabilities of consolidated Funds | | |
Total fair value liabilities | | 0 |
Consolidated Funds | Significant other observable inputs (Level II) | Common stock | | |
Liabilities of consolidated Funds | | |
Total fair value liabilities | | 0 |
Consolidated Funds | Significant other observable inputs (Level II) | Common and preferred stock | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Consolidated Funds | Significant other observable inputs (Level II) | Short-term investment funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Consolidated Funds | Significant other observable inputs (Level II) | Fixed income securities | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Consolidated Funds | Significant other observable inputs (Level II) | Collective investment Funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 32.5 |
Consolidated Funds | Significant other observable inputs (Level II) | Other Investments | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 1.8 |
Consolidated Funds | Significant unobservable inputs (Level III) | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Restricted cash held at fair value | | 0 |
Total fair value assets | | 0 |
Liabilities of consolidated Funds | | |
Total fair value liabilities | | 0 |
Consolidated Funds | Significant unobservable inputs (Level III) | Common stock | | |
Liabilities of consolidated Funds | | |
Total fair value liabilities | | 0 |
Consolidated Funds | Significant unobservable inputs (Level III) | Common and preferred stock | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Consolidated Funds | Significant unobservable inputs (Level III) | Short-term investment funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Consolidated Funds | Significant unobservable inputs (Level III) | Fixed income securities | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Consolidated Funds | Significant unobservable inputs (Level III) | Collective investment Funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Consolidated Funds | Significant unobservable inputs (Level III) | Other Investments | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Consolidated Entity Excluding Consolidated Funds | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 94.2 |
Investment securities | 66.4 | 59.7 |
Investments in unconsolidated funds | 34.4 | 34.5 |
Total fair value assets | 100.8 | 94.2 |
Consolidated Entity Excluding Consolidated Funds | Quoted prices in active markets (Level I) | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 59.7 |
Investment securities | 66.4 | 59.7 |
Investments in unconsolidated funds | 0 | 0 |
Consolidated Entity Excluding Consolidated Funds | Significant other observable inputs (Level II) | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 0 |
Investment securities | 0 | 0 |
Investments in unconsolidated funds | 0 | 0 |
Consolidated Entity Excluding Consolidated Funds | Significant unobservable inputs (Level III) | | |
Assets of consolidated Funds | | |
Total investments at fair value | | 34.5 |
Investment securities | 0 | 0 |
Investments in unconsolidated funds | $ 34.4 | $ 34.5 |
Consolidated Entity Excluding Consolidated Funds | Significant unobservable inputs (Level III) | Minimum | Real estate investment funds | | |
Assets of consolidated Funds | | |
Term over which the underlying assets are expected to be liquidated by the investees | 1 year | |
Consolidated Entity Excluding Consolidated Funds | Significant unobservable inputs (Level III) | Maximum | Real estate investment funds | | |
Assets of consolidated Funds | | |
Term over which the underlying assets are expected to be liquidated by the investees | 8 years | |