What was the change in Other in 2019 from 2018 under Billings by Product?
{"": {"FY19": "$m (Reported)", "FY18": "$m (Reported)"}, "Billings by Region: -- - Americas": {"FY19": 267.8, "FY18": 270.0}, "Billings by Region: -- - EMEA": {"FY19": 395.3, "FY18": 395.1}, "Billings by Region: -- - APJ": {"FY19": 97.2, "FY18": 103.5}, "Billings by Region: -- ": {"FY19": 760.3, "FY18": 768.6}, "Billings by Product: --  Network": {"FY19": 345.9, "FY18": 353.4}, "Billings by Product: --  Enduser": {"FY19": 377.1, "FY18": 383.2}, "Billings by Product: --  Other": {"FY19": 37.3, "FY18": 32.0}, "Billings by Product: -- ": {"FY19": 760.3, "FY18": 768.6}, "Billings by Type: --  Subscription": {"FY19": 644.6, "FY18": 644.2}, "Billings by Type: --  Hardware": {"FY19": 105.7, "FY18": 113.7}, "Billings by Type: --  Other": {"FY19": 10.0, "FY18": 10.7}, "Billings by Type: -- ": {"FY19": 760.3, "FY18": 768.6}}
other_billings_2019 = df["Billings by Product: --  Other"]["FY19"]
other_billings_2018 = df["Billings by Product: --  Other"]["FY18"]
answer = other_billings_2019 - other_billings_2018