Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2015	Dec. 31, 2012
Income Tax Examination [Line Items]
Income tax expense	$ 51.2	$ 26.4	$ 29.6
Income before income tax	$ 157.9	$ 158.1	$ 125.1
Effective tax rate	32.40%	16.70%	23.70%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	$ 0.0	$ 0.0	$ 12.0
Excess benefit from stock-based compensation	$ 2.5	$ 5.6	$ 0.0
U.S. statutory rate	21.00%	35.00%	35.00%
Tax Cuts and Jobs Act, GILTI Tax, Income Tax Expense	$ 4.2
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)	3.1
Tax Cuts and Jobs Act, Transition Tax, Income Tax Expense	0.3
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense				$ 38.3
Increase Decrease In Income Taxes Payable, Transition Tax	3.1
Tax Cuts and Jobs Act, Effect on Executive Compensation, Income Tax Expense	3.3
Tax Cuts and Jobs Act, Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions, Executive Compensation	1.5
Tax Cuts and Jobs Act, Impairment of Deferred Tax Assets, Executive Compensation, Income Tax Expense	1.8
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset - Pension, Income Tax Benefit	0.5
Realized Foreign Exchange Loss on Intercompany Loan	0.0	$ 0.0	$ 9.6
Expiration of tax credits	0.0	0.0	10.9
Operating loss carryforwards	443.8			443.8
Deferred Federal Income Tax Expense (Benefit) - Undistributed Earnings of Foreign Subsidiaries	1.4
Undistributed Earnings of Foreign Subsidiaries Not Permanently Reinvested	369.0			369.0
Undistributed earnings of foreign subsidiaries	106.0			106.0
Unrecognized tax benefits, income tax penalties and interest accrued	13.0			13.0
Unrecognized tax benefits	43.7	47.2	43.7	43.7	$ 34.8
Unrecognized tax benefits that would impact effective tax rate	42.0			42.0
Foreign tax credit carryforwards	$ 25.2	29.1		$ 25.2
Earliest Tax Year
Income Tax Examination [Line Items]
Operating loss carryforwards, expiration year	2019
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	2014
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Income Tax Examination [Line Items]
Penalty rate	75.00%			75.00%
Potential penalty rate	150.00%			150.00%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes - Foreign, Amount	$ 5.6
Income tax examination, interest expense	$ 1.1	2.2	2.8
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2013
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Years 2007-2012
Income Tax Examination [Line Items]
Unrecognized tax benefits	$ 29.4			$ 29.4		$ 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	$ 21.0			21.0
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	2013
Foreign Tax Authority | Swedish Tax Agency (Skatteverket) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2012
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2017
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)
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Liability, Income Tax Benefits				50.2
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
Tax Cuts and Jobs Act, Transition Toll Tax for Accumulated Foreign Earnings, Income Tax Expense, net of foreign tax credits				$ 24.3
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
Foreign tax credit carryforwards		14.0
Domestic Tax Authority | Internal Revenue Service (IRS) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2015
U.S. state and foreign jurisdictions
Income Tax Examination [Line Items]
Net tax (benefit) expense from release and generation of valuation allowances	$ 6.9	$ (0.7)
PA Acquisition
Income Tax Examination [Line Items]
Revaluation gain/loss on previously held joint-venture equity interest			$ 28.9
U.S. | Pension
Income Tax Examination [Line Items]
Defined Benefit Plan Contributions By Employer, Additional Tax Deductible Contribution	$ 4.1