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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Reserves Deducted From Assets in the Consolidated Balance Sheet      
Valuation and Qualifying Account      
Balance at beginning of year $ 29.7 $ 39.1 $ 39.5
Charged (credited) to costs and expenses 21.7 31.6 43.5
Balance at end of year 27.3 29.7 39.1
Reserves Deducted From Assets in the Consolidated Balance Sheet | Allowance for Doubtful Accounts      
Valuation and Qualifying Account      
Other [1] (24.1) (39.6) (43.0)
Reserves Deducted From Assets in the Consolidated Balance Sheet | Allowance for Foreign Currency Exchange Effects      
Valuation and Qualifying Account      
Other [2]   (1.4) (0.9)
Other Reserves      
Valuation and Qualifying Account      
Balance at beginning of year 131.3 59.2 97.6
Charged (credited) to costs and expenses (5.8) 5.1 0.4
Balance at end of year 114.3 131.3 59.2
Other Reserves | Deferred Tax Assets Valuation Allowance      
Valuation and Qualifying Account      
Other [3] (8.8) 66.1 (34.0)
Other Reserves | Decrease in Unusable Foreign Operating Loss Carryforwards      
Valuation and Qualifying Account      
Other [4] $ (2.4) (2.6)  
Other Reserves | Acquisitions      
Valuation and Qualifying Account      
Other   $ 3.5 [5] $ (4.8) [4]
[1] Uncollectible accounts written off, net of recoveries.
[2] Effects of currency exchange.
[3] Foreign tax credit valuation allowance adjustment.
[4] Decrease in unusable foreign operating loss carryforwards.
[5] Acquisitions