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Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
year
NOL and Tax Credit Carryforwards [Line Items]          
Income Taxes Receivable   $ 6,900,000      
Transition tax liability   5,900,000      
Foreign earnings inclusion, Global Intangible Low-Taxed Income (GILTI)   25,700,000      
Estimate of federal limit on deductible interest expense   38,000,000      
Benefit from re-measurement of indefinite lived deferred tax liabilities   2,600,000      
Benefit from decrease in deferred tax asset valuation allowance   1,500,000      
Impact of U.S. tax reform $ (4,100,000)        
Number of years in cumulative loss profit position | year         3
Valuation allowance   (48,000,000) $ (14,500,000) $ 171,500,000 $ 74,500,000
Income (loss) before income taxes   247,700,000 (86,500,000) (734,000,000)  
Income from continuing operations before income taxes, domestic   190,800,000 (119,800,000) (782,100,000)  
Accumulated other comprehensive loss, net of tax 1,027,800,000 1,133,800,000 1,027,800,000 1,093,700,000 1,014,500,000
Transition tax expense   5,900,000 0    
Impact of U.S. tax reform   (5,900,000) 4,100,000 0  
Foreign income taxable due to legislative changes     100,000,000    
Transition tax for accumulated foreign earnings, liability 35,000,000 34,100,000 35,000,000    
Mandatory repatriation of foreign earnings, income   97,500,000      
Total deferred income tax assets 468,900,000 478,800,000 468,900,000    
Payment of transition tax for accumulated foreign earnings   500,000      
Net operating loss tax carryovers 336,100,000 307,500,000 336,100,000    
Income tax refunds received   1,600,000 7,100,000 10,500,000  
Deferred taxes for foreign withholding taxes   3,200,000      
Unrecognized tax benefits classified within deferred taxes as a reduction of net operating loss carryforwards 11,700,000 12,100,000 11,700,000    
Unrecognized tax benefits that would impact effective tax rate   3,000,000      
Unrecognized tax benefits that will be recognized within 12 months of year end   1,000,000      
Tax Cuts and Jobs Act Of 2017, Transition Tax for Accumulated Foreign Earnings, Deferred Tax Asset Adjustment   (1,200,000)      
Federal and State Deferred Tax Assets          
NOL and Tax Credit Carryforwards [Line Items]          
Valuation allowance   (46,300,000)   165,800,000 68,400,000
Accumulated Deferred Tax Asset Valuation Allowance          
NOL and Tax Credit Carryforwards [Line Items]          
Accumulated other comprehensive loss, net of tax 28,800,000 49,300,000 28,800,000 45,600,000 $ 0
State [Member]          
NOL and Tax Credit Carryforwards [Line Items]          
Tax credit carryforwards   12,000,000      
Federal          
NOL and Tax Credit Carryforwards [Line Items]          
Income tax refunds received     3,200,000 $ 7,300,000  
Tax Cuts and Jobs Act, Transition Tax Liability          
NOL and Tax Credit Carryforwards [Line Items]          
Tax credit carryforwards   28,200,000      
Total deferred income tax assets 468,900,000   468,900,000    
Net operating loss tax carryovers 355,900,000   355,900,000    
Tax Cuts and Jobs Act, Transition Tax Liability | Scenario, Adjustment          
NOL and Tax Credit Carryforwards [Line Items]          
Total deferred income tax assets 0   0    
Net operating loss tax carryovers $ 19,800,000   $ 19,800,000    
Tax Cuts and Jobs Act, NOL preserved [Member]          
NOL and Tax Credit Carryforwards [Line Items]          
Net operating loss tax carryovers   $ 97,500,000