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Fair Value Measurements - Fair Value of Long-Term Debt, Including Current Portion (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion, Carrying Amount $ 3,749.2 $ 2,939.0
Convertible Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion, Carrying Amount 1,163.1 1,120.6
Long-term debt, including current portion, Fair Value 1,730.2 1,368.5
Long-term Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion, Carrying Amount 2,449.3 1,615.1
Long-term debt, including current portion, Fair Value $ 2,427.8 $ 1,585.9