What is the proportion of basic over diluted weighted-average shares outstanding in 2017?
{"Years ended December 31, -- ": {"2019": 2019.0, "2018": 2018.0, "2017": 2017.0}, "Years ended December 31, -- Basic weighted-average shares outstanding": {"2019": 103.9, "2018": 103.2, "2017": 102.2}, "Effect of potential common stock: -- Common stock awards": {"2019": 1.2, "2018": 1.2, "2017": 1.3}, "Effect of potential common stock: -- Diluted weighted-average shares outstanding": {"2019": 105.1, "2018": 104.4, "2017": 103.5}}
basic_2017 = df["Years ended December 31, -- Basic weighted-average shares outstanding"]["2017"]
diluted_2017 = df["Effect of potential common stock: -- Diluted weighted-average shares outstanding"]["2017"]
answer = basic_2017 / diluted_2017