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Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Recurring
$ in Millions
Dec. 31, 2020
USD ($)
Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Investments $ 97.9
Derivative asset 0.0
Derivative liability 0.0
Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Investments 9.4
Derivative asset 0.5
Derivative liability 9.0
Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Investments 0.0
Derivative asset 0.0
Derivative liability $ 0.0