Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Goodwill Intangible Assets (Details)

v3.8.0.1
Intangible Assets and Goodwill Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Sep. 30, 2017
Schedule of Intangible Assets [Line Items]      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 4.6    
Finite-Lived Intangible Assets, Gross 618.1 $ 618.1 $ 598.1
Finite-Lived Intangible Assets, Accumulated Amortization 231.6 231.6 207.6
Indefinite and Finite Lived Intangible Assets, Gross 749.4   731.5
Trade Names [Member]      
Schedule of Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 0.2 0.2 0.2
Finite-Lived Intangible Assets, Accumulated Amortization 0.1 0.1 0.1
Customer Relationships [Member]      
Schedule of Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 477.4 477.4 468.7
Finite-Lived Intangible Assets, Accumulated Amortization 140.0 140.0 125.9
Technology-Based Intangible Assets [Member]      
Schedule of Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 82.8 82.8 80.7
Finite-Lived Intangible Assets, Accumulated Amortization 43.7 43.7 39.9
Computer Software, Intangible Asset [Member]      
Schedule of Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 57.5 57.5 48.3
Finite-Lived Intangible Assets, Accumulated Amortization 47.6 47.6 41.5
Other Intangible Assets [Member]      
Schedule of Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 0.2 0.2 0.2
Finite-Lived Intangible Assets, Accumulated Amortization 0.2 0.2 0.2
After Tax [Member]      
Schedule of Intangible Assets [Line Items]      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 3.5    
Trade Names [Member]      
Schedule of Intangible Assets [Line Items]      
Indefinite-Lived Intangible Assets (Excluding Goodwill) 131.3 131.3 $ 133.4
Customer Concentration Risk [Member] | Trade Names [Member]      
Schedule of Intangible Assets [Line Items]      
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 4.0 $ 4.0  
Minimum      
Schedule of Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life   3 years  
Maximum      
Schedule of Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life   21 years