Variable Interest Entities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 15, 2020	Dec. 31, 2019	Sep. 30, 2019
Variable Interest Entity [Line Items]
Assets	$ 3,868.6	$ 2,000.0	$ 2,092.2	$ 1,893.7
Blue Ribbon
Variable Interest Entity [Line Items]
DIP Loan	27.5
Variable Interest Entity, Not Primary Beneficiary | Investments in unconsolidated affiliates
Variable Interest Entity [Line Items]
Assets	18.7		440.2
Maximum Exposure	18.7		440.2
Variable Interest Entity, Not Primary Beneficiary | Notes receivable
Variable Interest Entity [Line Items]
Assets	21.6		0.0
Maximum Exposure	27.9		0.0
Variable Interest Entity, Not Primary Beneficiary | Forward Purchase Agreements
Variable Interest Entity [Line Items]
Assets	26.0		0.0
Maximum Exposure	$ 26.0		$ 0.0