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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Related Party Transactions |  |  |  |  |  |
Other liabilities | $ 179.7 |  |  | $ 179.7 |  | $ 213.3
Non-controlling interests | 865.8 |  |  | 865.8 |  | 932.0
Imputed interest expense and contingent payment arrangements | (0.8) |  | $ 13.2 | 1.1 | $ 40.4 |
Prior Owner | Private Equity Investment Partnerships of Affiliate |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Other liabilities | 73.2 |  |  | 73.2 |  | 75.0
Non-controlling interests | 4.0 |  |  | 4.0 |  | 5.1
Affiliated Entity |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Imputed interest expense and contingent payment arrangements |  |  | (15.0) |  | $ (44.7) |
Affiliated Entity | Imputed interest expense and contingent payment arrangements |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Imputed interest expense and contingent payment arrangements |  | $ (2.8) |  |  |  |
Affiliated Entity | Other Liabilities |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Contingent payment arrangements liability | $ 8.0 |  |  | 8.0 |  | $ 10.2
Payments for contingent payment arrangements liabilities |  |  | $ 17.5 | $ 0.0 |  |

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