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Stock Compensation - Consolidated Stock Compensation Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock-based compensation $ 25.0 $ 19.9 $ 40.0 $ 34.0