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Other Balance Sheet Information - Other Balance Sheet Information of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Sep. 30, 2017
Balance Sheet Related Disclosures [Abstract]    
Equipment $ 373.2 $ 357.9
Equipment under customer usage agreements 391.1 368.7
Building and improvements 173.7 172.0
Leasehold improvements 62.1 60.6
Land 46.5 46.3
Furniture and fixtures 21.4 20.8
Property, plant and equipment, gross 1,068.0 1,026.3
Less – accumulated depreciation and amortization (599.4) (553.5)
Property, plant and equipment, net $ 468.6 $ 472.8