Income Taxes (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosures [Line Items]
Tax Act - deemed repatriation tax	$ 32.6	$ 36.6	$ 0.0
Impact of Tax Cuts and Jobs Act of 2017 tax expense recorded	41.1
Income Tax Effects Allocated Directly to Equity	$ 4.8	$ 7.2	(1.8)
Federal Statutory Income Tax Rate	21.00%	35.00%
Transition Tax on Foreign Fiscal Year	$ 8.5
Effective Income Tax Rate Reconciliation, Percent	7.20%	14.70%
Foreign subsidiary earnings	$ 4.9	$ 14.4	13.7
Income tax penalties and interest accrued	6.3	5.5
Operating loss carryforwards	964.8
Net loss carryforward, deferred tax asset	160.0	125.9
Operating loss carryforwards, set to expire	647.2
Operating loss carryforwards, no expiration	317.6
Tax credit carryforwards, foreign	68.4
Tax credit carryforwards, general business	5.7
Deferred tax asset, change in amount	(69.8)	17.8
Deferred tax liability not recognized, amount of unrecognized deferred tax liability	865.4
Income tax expense			93.9
Tax Act Of 2017 Income Tax Expense Benefit		81.7
Tax Act - rate impact on deferred tax balance	$ 2.5	(45.1)	0.0
Minimum
Income Tax Disclosures [Line Items]
Recognition of tax positions, likelihood of being realized upon settlement	50.00%
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Income Tax Disclosures [Line Items]
Income Tax Effects Allocated Directly to Equity	$ 11.6	$ 9.9	$ 7.7