Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 31, 2017	May 02, 2016	Dec. 31, 2014	Dec. 31, 2012
Income Tax Examination [Line Items]
Income tax expense		$ 26.4	$ 29.6	$ 45.5
Income before income tax		$ 158.1	$ 125.1	$ 131.4
Effective tax rate		16.70%	23.70%	34.60%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount		$ 0.0	$ 12.0	$ 0.0
Excess benefit from stock-based compensation		$ 5.6	$ 0.0	$ 0.0
U.S. statutory rate		35.00%	35.00%	35.00%
Realized Foreign Exchange Loss on Intercompany Loan		$ 0.0	$ 9.6	$ 0.0
Expiration of tax credits		0.0	10.9	1.0
Undistributed earnings of foreign subsidiaries		500.0
Operating loss carryforwards		529.6
Unrecognized tax benefits, income tax penalties and interest accrued		14.7
Unrecognized tax benefits		47.2	43.7	34.8			$ 45.9
Unrecognized tax benefits that would impact effective tax rate		45.5
Effect of the U.S. Tax Act		(25.7)	0.0	0.0
Foreign tax credit carryforwards		$ 29.1	0.0
Earliest Tax Year
Income Tax Examination [Line Items]
Operating loss carryforwards, expiration year		2018
Latest tax year
Income Tax Examination [Line Items]
Operating loss carryforwards, expiration year		2031
State and Local Jurisdiction | Minimum
Income Tax Examination [Line Items]
Statutes of limitation, period		2 years
State and Local Jurisdiction | Maximum
Income Tax Examination [Line Items]
Statutes of limitation, period		5 years
Foreign Tax Authority | Minimum
Income Tax Examination [Line Items]
Statutes of limitation, period		2 years
Foreign Tax Authority | Maximum
Income Tax Examination [Line Items]
Statutes of limitation, period		5 years
Foreign Tax Authority | Australian Taxation Office | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year		2013
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Income Tax Examination [Line Items]
Penalty rate		75.00%
Potential penalty rate		150.00%
Income tax examination, interest expense		$ 2.2	2.8	2.7
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year		2011
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2011
Income Tax Examination [Line Items]
Unrecognized tax benefits		$ 5.5
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Years 2007-2012
Income Tax Examination [Line Items]
Unrecognized tax benefits		38.7						$ 44.5
Potential tax assessment, accrued reserve related to fair value of liabilities acquired								$ 43.3
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2008 to 2010
Income Tax Examination [Line Items]
Unrecognized tax benefits		$ 24.6
Foreign Tax Authority | Canada Revenue Agency | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year		2009
Foreign Tax Authority | Federal Ministry of Finance, Germany | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year		2011
Foreign Tax Authority | Swedish Tax Agency (Skatteverket) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year		2011
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year		2016
Domestic Tax Authority | Internal Revenue Service (IRS)
Income Tax Examination [Line Items]
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit)		$ (25.7)
Transition Toll Tax - Tax rate on cash		15.50%
Transition Toll Tax - Tax rate on all other earnings		8.00%
Transition Toll Tax		$ 38.0
Transition Toll Tax Payable Current		$ 3.0
Transition Toll Tax - years of which the transition toll tax is to be paid.		8 years
Foreign tax credit carryforwards		$ 14.0
Transition Toll Tax - net		24.0
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Benefit		$ 49.7
Domestic Tax Authority | Internal Revenue Service (IRS) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year		2014
U.S. state and foreign jurisdictions
Income Tax Examination [Line Items]
Net tax (benefit) expense from release and generation of valuation allowances		$ (0.7)	(0.7)	$ (0.3)
PA Acquisition
Income Tax Examination [Line Items]
Revaluation gain/loss on previously held joint-venture equity interest			$ 28.9
Deferred tax liabilities						$ 0.2
Deferred tax assets						$ 5.7
Esselte Acquisition
Income Tax Examination [Line Items]
Deferred tax liabilities					$ 83.6
Deferred tax assets					$ 106.3
Forecast
Income Tax Examination [Line Items]
U.S. statutory rate	21.00%