Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Examination [Line Items]
Income taxes	$ (2,000,000)			$ 50,400,000
Deemed repatriation tax				67,300,000
Increase associated with Tax on undistributed earnings deferred tax liability				9,000,000.0
Other reconciling items				200,000
Decrease to overall net deferred tax liability				26,100,000
Deemed repatriation tax payable			$ 1,300,000
Change in enacted tax rate, amount			500,000
Prepaid income taxes and taxes receivable (recovered) applied against the deemed repatriation tax liability		$ 27,800,000	28,400,000
Deemed repatriation tax payable		32,800,000	32,200,000
Deferred tax liability associated with pp&e		17,000,000.0
GILTI expense		9,300,000
Benefit to tax rate, amount			2,300,000
Reduction of valuation allowance			7,800,000
Deferred tax liabilities		327,200,000	189,600,000
Maximum tax carryforward expiring annually		10,000,000.0
Other net tax detriments		3,600,000	(9,100,000)
Benefit from foreign tax withholdings			(14,600,000)
Tax benefits from activities during the period		(12,900,000)		25,200,000
Unrecognized tax benefits		8,600,000	11,000,000.0	$ 13,600,000
Unrecognized tax benefits that would impact effective tax rate		6,700,000
Permanent reinvestment on earnings		754,500,000
Cumulative undistributed earnings that are indefinitely reinvested		326,500,000
Resulting provisional incremental tax expense		16,000,000.0
Intangible assets
Income Tax Examination [Line Items]
Deferred tax liabilities		199,500,000	$ 84,600,000
Intangible assets | ECS
Income Tax Examination [Line Items]
Deferred tax liabilities		$ 114,900,000