What was the change in Net income from continuing operations between 2017 and 2018?
{"Net income from continuing operations": {"2019": 355.9, "2018": 255.4, "2017": 170.6}, "Basic weighted average common shares outstanding": {"2019": 236.2, "2018": 232.9, "2017": 217.2}, "Dilutive effect of stock options and RSUs": {"2019": 3.8, "2018": 4.4, "2017": 4.4}, "Dilutive effect of 2007 Junior Convertible Debt": {"2019": "\u2014", "2018": 1.3, "2017": 12.7}, "Dilutive effect of 2015 Senior Convertible Debt": {"2019": 9.9, "2018": 10.3, "2017": 0.5}, "Dilutive effect of 2017 Senior Convertible Debt": {"2019": "\u2014", "2018": "\u2014", "2017": "\u2014"}, "Dilutive effect of 2017 Junior Convertible Debt": {"2019": "\u2014", "2018": "\u2014", "2017": "\u2014"}, "Diluted weighted average common shares outstanding": {"2019": 249.9, "2018": 248.9, "2017": 234.8}, "Basic net income per common share from continuing operations": {"2019": 1.51, "2018": 1.1, "2017": 0.79}, "Diluted net income per common share from continuing operations": {"2019": 1.42, "2018": 1.03, "2017": 0.73}}
net_income_from_continuing_operations_2018 = df["Net income from continuing operations"]["2018"]
net_income_from_continuing_operations_2017 = df["Net income from continuing operations"]["2017"]
answer = net_income_from_continuing_operations_2018 - net_income_from_continuing_operations_2017