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Fair Value Measurements (Schedule of Nonrecurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, loss   $ 59.1 $ 0.0  
Equity method investment impairment charge   79.5 $ 0.0  
Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Equity method investment impairment charge $ 79.5 79.5 [1]    
Continuing Operations [Member] | Asset Actions [Member] | Industrial Gases - EMEA [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, loss [2]   45.7    
Discontinued Operations [Member] | Asset Actions [Member] | Energy From Waste [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, held for sale, loss [2]   6.3    
Nonrecurring Basis [Member] | Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Investment in Equity Affiliate [1] 68.5 68.5    
Nonrecurring Basis [Member] | Continuing Operations [Member] | Asset Actions [Member] | Industrial Gases - EMEA [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, fair value [2]       $ 1.4
Nonrecurring Basis [Member] | Discontinued Operations [Member] | Asset Actions [Member] | Energy From Waste [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, held for sale, fair value [2]       11.0
Nonrecurring Basis [Member] | Level 1 [Member] | Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Investment in Equity Affiliate [1] 0.0 0.0    
Nonrecurring Basis [Member] | Level 1 [Member] | Continuing Operations [Member] | Asset Actions [Member] | Industrial Gases - EMEA [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, fair value [2]       0.0
Nonrecurring Basis [Member] | Level 1 [Member] | Discontinued Operations [Member] | Asset Actions [Member] | Energy From Waste [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, held for sale, fair value [2]       0.0
Nonrecurring Basis [Member] | Level 2 [Member] | Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Investment in Equity Affiliate [1] 0.0 0.0    
Nonrecurring Basis [Member] | Level 2 [Member] | Continuing Operations [Member] | Asset Actions [Member] | Industrial Gases - EMEA [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, fair value [2]       0.0
Nonrecurring Basis [Member] | Level 2 [Member] | Discontinued Operations [Member] | Asset Actions [Member] | Energy From Waste [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, held for sale, fair value [2]       0.0
Nonrecurring Basis [Member] | Level 3 [Member] | Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Investment in Equity Affiliate [1] $ 68.5 $ 68.5    
Nonrecurring Basis [Member] | Level 3 [Member] | Continuing Operations [Member] | Asset Actions [Member] | Industrial Gases - EMEA [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, fair value [2]       1.4
Nonrecurring Basis [Member] | Level 3 [Member] | Discontinued Operations [Member] | Asset Actions [Member] | Energy From Waste [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Plant and Equipment, held for sale, fair value [2]       $ 11.0
[1] We assessed the recoverability of the carrying value of our equity investment in AHG. We estimated the fair value of our investment using weighting of the results of the income and market approaches. An impairment loss was recognized for the difference between the carrying amount and the fair value of the investment as of 30 June 2017. For additional information, see Note 7, Equity Affiliates.
[2] We assessed the recoverability of the carrying value of assets associated with the EfW discontinued operation, including the air separation unit within continuing operations of our Industrial Gases – EMEA segment. We based our estimates primarily on an orderly liquidation valuation which resulted in losses for the difference between the orderly liquidation value and net book value of the assets as of 31 December 2016. There have been no significant updates to our estimates as of 30 June 2017. For additional information, see Note 3, Discontinued Operations, and Note 5, Cost Reduction and Asset Actions.