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Other Balance Sheet Information - Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Sep. 30, 2017
Balance Sheet Related Disclosures [Abstract]    
Equipment $ 378.1 $ 357.9
Equipment under customer usage agreements 390.1 368.7
Building and improvements 173.5 172.0
Leasehold improvements 62.3 60.6
Land 46.4 46.3
Furniture and fixtures 20.7 20.8
Property, plant and equipment, gross 1,071.1 1,026.3
Less – accumulated depreciation and amortization (609.6) (553.5)
Property, plant and equipment, net $ 461.5 $ 472.8