Industry Segments and Geographic Operations (Schedule Of Business Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended										12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues	$ 751.8		$ 741.6	$ 716.7	$ 740.5	$ 763.9		$ 749.5	$ 736.4	$ 605.7	$ 2,950.6	$ 2,855.5	$ 2,046.1
Depreciation											141.5	142.9	85.5
Amortization											27.0	24.7	5.3
Restructuring charges											7.2	1.7	5.4
Asset impairment											0.0	(1.6)	1.5
Operating income (loss)	61.1	[1]	$ 47.8	$ 36.3	$ 49.2	49.9	[2]	$ 42.0	$ 36.9	$ 22.0	194.4	150.8	137.4
Assets	2,358.1					2,416.1					2,358.1	2,416.1
Long-Lived Assets	1,534.7					1,632.4					1,534.7	1,632.4
North America [Member]
Revenues											2,321.6	2,320.3	1,860.8
Long-Lived Assets	977.9					1,038.1					977.9	1,038.1
Non-US [Member]
Revenues											629.0	535.2	$ 185.3
Long-Lived Assets	556.8					594.3					$ 556.8	$ 594.3
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Concentration risk percent											21.30%	23.70%	33.40%
Accounts Receivable, Net	$ 84.0					$ 92.4					$ 84.0	$ 92.4
Comcast [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Concentration risk percent													12.40%

[1] Fourth quarter 2015 includes a decrease in operating income of $13.4 resulting from $3.5 of integration related expenses associated with Convergys’ acquisition of Stream, $3.6 of depreciation expense resulting from the fair value write-up of property and equipment acquired from Stream, and $6.3 of amortization expense related to acquired intangible assets. Fourth quarter 2015 also includes $1.9 of tax expense for a change in estimate between tax previously accrued for the repatriation of foreign earnings and the revised estimates as of December 31, 2015.

[2] Fourth quarter 2014 includes a decrease in operating income of $16.7 resulting from $2.2 of integration related expenses associated with Convergys’ acquisition of Stream, $1.7 of pension settlement charge, $5.6 of depreciation expense resulting from the fair value write-up of property and equipment acquired from Stream, and $7.2 of amortization expense related to acquired intangible assets. Fourth quarter 2014 also includes $4.5 of tax benefit for a change in estimate between tax previously accrued for the repatriation of foreign earnings and the revised estimates as of December 31, 2014.