Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Goodwill [Line Items]
Goodwill, currency translation gains (losses)			$ 3,800,000	$ (10,200,000)
Goodwill, additions from new business combinations			0	0
Amortization expense, intangible assets	$ 5,300,000	$ 7,300,000	10,500,000	14,600,000
Earn-Out Arrangements [Member]
Goodwill [Line Items]
Goodwill, accruals of acquisition-related contingent consideration			5,800,000	$ 800,000
Goodwill, Accumulated Impairment Losses [Member]
Goodwill [Line Items]
Goodwill, currency translation gains (losses)			(4,200,000)
Goodwill, Gross Carrying Amount [Member]
Goodwill [Line Items]
Goodwill, currency translation gains (losses)			$ 8,000,000