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Acquisitions, Assets and Liabilities Held for Sale (Details) $ in Millions				3 Months Ended
		Jun. 23, 2016 USD ($)	May 01, 2016 USD ($)	Mar. 31, 2016 item	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Acquisitions
Previous percentage ownership of noncontrolling owners					49.00%
Capital in excess of par value	[1]				$ 411.0	$ 435.3
2016 Acquisitions
Acquisitions
Number of airports to be acquired | item				83
Tobras
Acquisitions
Estimated purchase price		$ 3.7
Previous percentage ownership of noncontrolling owners		49.00%
Previous percentage of ownership of parent		51.00%
Capital in excess of par value		$ 10.9
Cash paid for acquisition of business		3.7
Increase in noncontrolling interest equity		$ 7.2
Land Segment | 2016 Acquisitions
Acquisitions
Number of businesses acquired | item				3
Disposal Group, Held-for-sale, Not Discontinued Operations | Pester
Assets and Liabilities Held for Sale
Cash received for disposal of retail business			$ 32.3
Disposal Group, Held-for-sale, Not Discontinued Operations | Pester | Other (expense) income, net
Assets and Liabilities Held for Sale
Gain (Loss) on disposal of retail business			$ 3.8
Disposal Group, Held-for-sale, Not Discontinued Operations | Tobras
Acquisitions
Previous percentage ownership of noncontrolling owners		49.00%
[1] Amounts may not add due to rounding

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