Debt And Capital Lease Obligations Debt And Capital Lease Obligations (Other) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Sep. 30, 2013	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument
Asset Securitization Facility		$ 150.0
Asset Securitization Facility, Expiration Date	January 2017
Accounts Receivable Securitization		$ 10.0	$ 0

Reflects when the asset securitization facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

No definition available.

Name:	cvg_AssetSecuritizationFacilityExpirationDate
Namespace Prefix:	cvg_
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration