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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event In April 2018, the Company announced that it has entered into two binding agreements (subject to regulatory approval) to sell (1) its off-street Parking business, including the Multipark System in France and the United Kingdom (U.K.), along with its U.S. Airport Parking business and (2) its U.S. Human Resource Consulting and Actuarial business and the Human Resource Consulting and Outsourcing business located in Canada and the U.K. The revenues generated from these businesses in 2017 were $321 million.