What is the change in Net long-term debt, including current maturities from year ended December 31, 2018 to 2019?
{"Amended Credit Agreement:   -- Revolving Credit Facility due 2024, interest payable monthly at3 .30% and 3.77%, respectively": {"December 31, 2019": 800.0, "December 31, 2018": 400.0}, "Amended Credit Agreement:   -- Term Loan B Facility due 2026, interest payable monthly at3 .80% and 4.27%, respectively": {"December 31, 2019": 1630.9, "December 31, 2018": 1134.5}, "Amended Credit Agreement:   -- 1.00% Notes due 2020 (1)": {"December 31, 2019": 690.0, "December 31, 2018": 690.0}, "Amended Credit Agreement:   -- 1.625% Notes due 2023 (2)": {"December 31, 2019": 575.0, "December 31, 2018": 575.0}, "Amended Credit Agreement:   -- Other long-term debt (3)": {"December 31, 2019": 53.3, "December 31, 2018": 139.5}, "Amended Credit Agreement:   -- Gross long-term debt, including current maturities": {"December 31, 2019": 3749.2, "December 31, 2018": 2939.0}, "Amended Credit Agreement:   -- Less: Debt discount (4)": {"December 31, 2019": -102.7, "December 31, 2018": -139.4}, "Amended Credit Agreement:   -- Less: Debt issuance costs (5)": {"December 31, 2019": -34.0, "December 31, 2018": -33.5}, "Amended Credit Agreement:   -- Net long-term debt, including current maturities": {"December 31, 2019": 3612.5, "December 31, 2018": 2766.1}, "Amended Credit Agreement:   -- Less: Current maturities": {"December 31, 2019": -736.0, "December 31, 2018": -138.5}, "Amended Credit Agreement:   --  Net long-term debt": {"December 31, 2019": 2876.5, "December 31, 2018": 2627.6}}
net_long_term_debt_2019 = df["Amended Credit Agreement:   -- Net long-term debt, including current maturities"]["December 31, 2019"]
net_long_term_debt_2018 = df["Amended Credit Agreement:   -- Net long-term debt, including current maturities"]["December 31, 2018"]
answer = net_long_term_debt_2019 - net_long_term_debt_2018