Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Other revenues (excluded from ASC 606)									$ 469.6	$ 559.0	$ 590.2
Revenues	$ 9,358.1	$ 9,322.7	$ 9,459.4	$ 8,678.8	$ 9,988.6	$ 10,429.5	$ 10,150.8	$ 9,181.3	36,819.0	39,750.3	33,695.5
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									4,357.7	5,120.1	4,436.8
Revenues									4,581.1	5,537.2	4,923.0
EMEA
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									8,988.9	9,353.4	7,428.1
Revenues									9,235.1	9,721.9	7,553.3
LATAM
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									3,637.7	3,173.6	2,619.8
North America
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									19,365.1	21,544.2	18,620.6
Aviation segment
Disaggregation of Revenue [Line Items]
Revenues									18,479.5	19,119.7	14,538.2
Aviation segment | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									1,410.2	1,564.6	1,086.8
Aviation segment | EMEA
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									3,824.3	3,641.4	2,532.1
Aviation segment | LATAM
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									2,347.1	1,931.6	1,365.5
Aviation segment | North America
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									10,933.0	12,025.7	9,644.5
Land segment
Disaggregation of Revenue [Line Items]
Revenues									10,280.9	11,381.1	10,958.0
Land segment | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									18.2	3.3	3.0
Land segment | EMEA
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									2,425.4	2,563.6	2,290.7
Land segment | LATAM
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									612.4	631.8	705.6
Land segment | North America
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									7,017.0	8,038.0	7,912.8
Marine segment
Disaggregation of Revenue [Line Items]
Revenues									8,058.5	9,249.5	8,199.3
Marine segment | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									2,929.2	3,552.1	3,347.0
Marine segment | EMEA
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									2,739.1	3,148.3	2,605.2
Marine segment | LATAM
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									678.1	610.2	548.8
Marine segment | North America
Disaggregation of Revenue [Line Items]
Revenue, ASC 606									$ 1,415.2	$ 1,480.5	$ 1,063.3