XML 113 R95.htm IDEA: XBRL DOCUMENT v3.20.4
Fair Value Measurements - Fair Value of Long-Term Debt, Including Current Portion (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion, carrying amount $ 3,589.5 $ 3,749.2
Convertible Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion, carrying amount 515.6 1,163.1
Long-term debt, including current portion, fair value 967.1 1,730.2
Long-term Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion, carrying amount 2,975.7 2,449.3
Long-term debt, including current portion, fair value $ 2,966.8 $ 2,427.8