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Other Intangible Assets and Goodwill (Finite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Mar. 31, 2019
Apr. 01, 2018
Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]          
Schedule of Finite-Lived Intangible Assets [Table Text Block]    
 
Mar 31, 2019
 
Sep 30, 2018
(in millions)
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Acquired and reacquired rights
$
1,110.3

 
$
(444.7
)
 
$
665.6

 
$
1,081.7

 
$
(320.1
)
 
$
761.6

Acquired trade secrets and processes
27.6

 
(17.9
)
 
9.7

 
27.6

 
(16.5
)
 
11.1

Trade names, trademarks and patents
37.2

 
(21.6
)
 
15.6

 
33.0

 
(19.5
)
 
13.5

Licensing agreements
14.6

 
(5.9
)
 
8.7

 
14.3

 
(5.1
)
 
9.2

Other finite-lived intangible assets
26.1

 
(12.4
)
 
13.7

 
25.6

 
(9.8
)
 
15.8

Total finite-lived intangible assets
$
1,215.8

 
$
(502.5
)
 
$
713.3

 
$
1,182.2

 
$
(371.0
)
 
$
811.2

    
Finite-Lived Intangible Assets, Gross $ 1,215.8   $ 1,215.8   $ 1,182.2
Finite-Lived Intangible Assets, Accumulated Amortization 502.5   502.5   371.0
Finite-Lived Intangible Assets, Net 713.3   713.3   811.2
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 68.7 $ 58.8 123.1 $ 72.8  
Acquired and reacquired rights          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 1,110.3   1,110.3   1,081.7
Finite-Lived Intangible Assets, Accumulated Amortization 444.7   444.7   320.1
Finite-Lived Intangible Assets, Net 665.6   665.6   761.6
Acquired trade secrets and processes [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 27.6   27.6   27.6
Finite-Lived Intangible Assets, Accumulated Amortization 17.9   17.9   16.5
Finite-Lived Intangible Assets, Net 9.7   9.7   11.1
Trade Names, Trademarks and Patents [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 37.2   37.2   33.0
Finite-Lived Intangible Assets, Accumulated Amortization 21.6   21.6   19.5
Finite-Lived Intangible Assets, Net 15.6   15.6   13.5
Licensing Agreements [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 14.6   14.6   14.3
Finite-Lived Intangible Assets, Accumulated Amortization 5.9   5.9   5.1
Finite-Lived Intangible Assets, Net 8.7   8.7   9.2
Other Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 26.1   26.1   25.6
Finite-Lived Intangible Assets, Accumulated Amortization 12.4   12.4   9.8
Finite-Lived Intangible Assets, Net $ 13.7   $ 13.7   $ 15.8