XML 64 R51.htm IDEA: XBRL DOCUMENT v3.20.4
Summary of Significant Accounting Policies - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Morgan Stanley    
Liabilities:    
Repurchase agreement amount $ 70.0  
Call option notice period 31 days  
Fair Value Measured on a Recurring Basis    
Short-term investments:    
Total assets measured and recorded at fair value $ 639.6 $ 98.0
Liabilities:    
Derivative liabilities 93.8 216.4
Total liabilities measured and recorded at fair value 93.8 216.4
Level 1 | Fair Value Measured on a Recurring Basis    
Short-term investments:    
Total assets measured and recorded at fair value 444.7 98.0
Liabilities:    
Derivative liabilities 0.0 0.0
Total liabilities measured and recorded at fair value 0.0 0.0
Level 2 | Fair Value Measured on a Recurring Basis    
Short-term investments:    
Total assets measured and recorded at fair value 194.9 0.0
Liabilities:    
Derivative liabilities 93.8 216.4
Total liabilities measured and recorded at fair value 93.8 216.4
Level 3 | Fair Value Measured on a Recurring Basis    
Short-term investments:    
Total assets measured and recorded at fair value 0.0 0.0
Liabilities:    
Derivative liabilities 0.0 0.0
Total liabilities measured and recorded at fair value 0.0 0.0
Reverse repurchase agreements | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 70.0  
Reverse repurchase agreements | Level 1 | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 0.0  
Reverse repurchase agreements | Level 2 | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 70.0  
Reverse repurchase agreements | Level 3 | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 0.0  
Commercial paper | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 102.0  
Short-term investments:    
Short-term investments 23.6  
Commercial paper | Level 1 | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 0.0  
Short-term investments:    
Short-term investments 0.7  
Commercial paper | Level 2 | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 102.0  
Short-term investments:    
Short-term investments 22.9  
Commercial paper | Level 3 | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 0.0  
Short-term investments:    
Short-term investments 0.0  
Money market funds | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 444.0 98.0
Money market funds | Level 1 | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 444.0 98.0
Money market funds | Level 2 | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents 0.0 0.0
Money market funds | Level 3 | Fair Value Measured on a Recurring Basis    
Cash and cash equivalents:    
Cash and cash equivalents $ 0.0 $ 0.0