Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Goodwill [Line Items]
Goodwill, currency translation gains (losses)				$ (18,500,000)
Goodwill, additions from new business combinations			$ 0	0
Amortization expense, intangible assets	$ 5,200,000	$ 6,900,000	15,700,000	21,500,000
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)			(3,100,000)
Goodwill, Gross Carrying Amount [Member]
Goodwill [Line Items]
Goodwill, currency translation gains (losses)			$ 6,000,000