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Segment and Geographic Information - Total Revenues by Geographic Location (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Revenues | $ 6,078.8 | $ 7,118.3 | $ 6,507.0 | $ 7,918.6 | $ 12,382.5 | $ 5,505.9 | $ 5,460.8 | $ 6,074.4 | $ 27,622.7 | $ 29,423.6 | $ 14,754.9
Gross Profit | 243.2 | $ 259.8 | $ 260.2 | $ 212.6 | 205.1 | $ 197.6 | $ 195.8 | $ 185.5 | 975.8 | 784.0 | 671.0
Long-Lived Assets | 42.4 |  |  |  | 38.7 |  |  |  | 42.4 | 38.7 | 29.4
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,587.6 | 1,168.0 | 817.1
Gross Profit |  |  |  |  |  |  |  |  | 695.3 | 529.4 | 457.0
Long-Lived Assets | 33.0 |  |  |  | 29.7 |  |  |  | 33.0 | 29.7 | 23.3
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 189.6 | 166.9 | 463.5
Gross Profit |  |  |  |  |  |  |  |  | 189.0 | 166.9 | 120.2
Long-Lived Assets | 6.8 |  |  |  | 7.3 |  |  |  | 6.8 | 7.3 | 4.8
South America [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 59.5 | 53.9 | 64.8
Gross Profit |  |  |  |  |  |  |  |  | 58.0 | 54.0 | 64.8
Long-Lived Assets | 1.4 |  |  |  | 1.5 |  |  |  | 1.4 | 1.5 | 1.2
Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 25,781.4 | 28,030.3 | 13,405.1
Gross Profit |  |  |  |  |  |  |  |  | 28.9 | 29.2 | 24.6
Long-Lived Assets | $ 1.2 |  |  |  | $ 0.2 |  |  |  | 1.2 | 0.2 | 0.1
Other (geographic location) [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4.6 | 4.5 | 4.4
Gross Profit |  |  |  |  |  |  |  |  | $ 4.6 | $ 4.5 | $ 4.4

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