Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value (Details)

v3.21.2
Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 18, 2020
1.75% Exchangeable Senior Debentures due 2046            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Interest rate (as a percent) 1.75%   1.75%   1.75%  
1.25% Exchangeable Senior Debentures due 2050            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Interest rate (as a percent) 1.25%   1.25%   1.25%  
2.75% Exchangeable Senior Debentures due 2050            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Interest rate (as a percent) 2.75%   2.75%   2.75%  
Exchangeable senior debentures            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Change in fair value $ 1.8 $ (15.3) $ (2.7) $ (15.3)    
Cumulative change     $ 5.9      
Exchangeable senior debentures | 1.75% Exchangeable Senior Debentures due 2046 | Indemnification obligation | LI LLC            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Interest rate (as a percent) 1.75%   1.75%      
Indemnity obligation recorded           $ 336.1