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Discontinued Operations (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 03, 2017
USD ($)
Oct. 01, 2016
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Distribution ratio of common stock in spin-off   0.5      
Minimum [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Transition service agreement months from spin-off date   12 months      
Maximum [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Transition service agreement months from spin-off date   24 months      
Performance Materials Division [Member] | Subsequent Event [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Sale of PMD $ 3,800.0        
Energy-from-Waste [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on disposal, before-tax     $ 59.3 $ 945.7 $ 945.7
Loss on disposal, net of tax     47.1 $ 846.6  
Accrual for actions to dispose of business     65.2   12.2
Energy-from-Waste [Member] | Continuing Operations [Member] | Other Noncurrent Liabilities [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Accrual for actions to dispose of business     60.0    
Energy-from-Waste [Member] | Discontinued Operations [Member] | Current Liabilities [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Accrual for actions to dispose of business     5.0    
Energy-from-Waste [Member] | Asset Actions [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on disposal, before-tax     6.3   913.5
Accrual for actions to dispose of business     0.0   0.0
Energy-from-Waste [Member] | Contract Actions/other [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on disposal, before-tax     53.0   32.2
Accrual for actions to dispose of business     $ 65.2   $ 12.2