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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jul. 13, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2015
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Oct. 01, 2015
Sep. 30, 2015
Income Taxes [Line Items]                  
U.S. corporate income tax rate   21.00% 35.00%   24.50%        
Provisional tax benefit         $ 166.7        
Estimated undistributed foreign earnings and profits         552.2        
Provisional income tax expense         $ 73.1        
Mandatory repatriation tax payable period         8 years        
Unrecognized tax benefits         $ 16.7 $ 20.9 $ 16.5   $ 12.4
NOLs Expiration Year         2038        
Undistributed foreign earnings remaining untaxed         $ 15.6        
Undistributed foreign earnings were taxed in the U.S.         552.2        
Tax benefit for reducing deferred tax liability           33.4      
Amount of taxable earnings on repatriation         1.7 5.7 3.0    
Valuation allowance         283.0 946.7 487.0    
Undistributed earnings of foreign subsidiaries         3.9   33.7    
Capital loss carryforwards         442.2        
Federal and state tax benefit         104.1        
Additional federal and state operating loss carryforwards         4.3        
Income tax benefit         (460.7) 38.1 (58.4)    
Valuation allowance, deferred tax asset $ 365.3       (605.6) 401.6      
Valuation allowance, net operating losses 12.3         14.7      
Unrecognized tax benefits that would impact effective tax rate         16.7        
Unrecognized tax benefits that would effect deferred tax assets         3.3        
Unrecognized tax benefits, income tax penalties and interest accrued         3.2 2.9      
Change in unrecognized tax benefits, income tax penalties and interest expense         0.3 0.1 0.5    
Goodwill impairment related to tax expense         22.6        
Impairment of goodwill         92.5   10.7    
Reduced unrecognized tax benefits         2.7        
Other Current Liabilities [Member]                  
Income Taxes [Line Items]                  
Repatriation tax liability         5.9        
Other Long-term Liabilities [Member]                  
Income Taxes [Line Items]                  
Repatriation tax liability         67.2        
Released [Member]                  
Income Taxes [Line Items]                  
Valuation allowance $ 4.9           111.1    
U.S. Net Deferred Tax Assets [Member]                  
Income Taxes [Line Items]                  
Valuation allowance         247.3 862.2 468.0    
Valuation allowance, deferred tax asset         (614.9) 394.2      
Foreign Net Deferred Tax Assets [Member]                  
Income Taxes [Line Items]                  
Valuation allowance         35.7 26.4 $ 19.0    
Valuation allowance, deferred tax asset         9.3 $ 7.4      
U.S. State Net Operating Losses [Member]                  
Income Taxes [Line Items]                  
Valuation allowance         61.4        
U.S. state net operating loss carryforwards         108.3        
Tax benefit related to NOLs expire unused         16.7        
Federal Net Operating Losses [Member]                  
Income Taxes [Line Items]                  
U.S. net operating loss carryforwards         2,452.7        
U.S. federal operating loss carryforwards expected to expire unused         661.0        
Tax benefit related to NOLs expire unused         138.8        
Income tax benefit         515.1        
Foreign Net Operating Losses [Member]                  
Income Taxes [Line Items]                  
Foreign operating loss carryforwards         122.8        
Tax benefit related to NOLs expire unused         26.6        
Foreign Net Operating Losses [Member] | Expire Fiscal 2019 [Member]                  
Income Taxes [Line Items]                  
Income tax benefit         30.4        
Tax Year 2019 [Member]                  
Income Taxes [Line Items]                  
Limits on deducting compensation, including performance-base compensation         $ 1.0        
Internal Revenue Service (IRS) [Member] | Ruling [Member]                  
Income Taxes [Line Items]                  
U.S. net operating losses, restored       $ 87.8          
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Ruling [Member]                  
Income Taxes [Line Items]                  
Valuation allowance       $ 16.2          
Accounting Standards Update 2016-09 [Member] | Domestic Tax Authority [Member]                  
Income Taxes [Line Items]                  
Valuation allowance               $ 25.1