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Acquisitions, Assets and Liabilities Held for Sale (Details) $ in Millions		3 Months Ended
		Mar. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)
Current assets held for sale
Current assets held for sale	[1]	$ 5.7	$ 5.5
Non-current assets held for sale
Non-current assets held for sale	[1]	33.5	36.5
Current liabilities held for sale
Current liabilities held for sale	[1]	5.5	5.6
Non-current liabilities held for sale
Non-current liabilities held for sale	[1]	$ 5.1	$ 5.0
Acquisitions 2016
Acquisitions
Number of airports to be acquired | item		83
Land Segment | Acquisitions 2016
Acquisitions
Number of businesses acquired | item		3
[1] Amounts may not add due to rounding

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