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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net income $ 169.1 $ 144.3
Depreciation and amortization 48.3 50.6
Stock-based compensation expense 14.9 17.7
Deferred income taxes 4.0 11.4
(Gain) loss on sale of assets 0.6 (9.9)
Foreign currency transaction gains (0.7) (1.5)
Debt extinguishment expense   8.5
Other non-cash adjustments 2.4 0.9
Changes in operating assets and liabilities 456.3 (157.2)
Net cash provided by operating activities 694.9 64.8
Investing activities:    
Additions to property, plant and equipment (38.3) (57.5)
Additions to equipment held for rental (4.1) (10.9)
Acquisition of business, net of cash acquired (112.1)  
Proceeds from sale of equipment held for rental 7.8 32.5
Other investing activities 1.1 (1.2)
Net cash used by investing activities (145.6) (37.1)
Financing activities:    
Proceeds from issuance of debt (original maturities greater than three months)   303.9
Repayments of debt (original maturities greater than three months) (5.2) (300.0)
Debt extinguishment and issuance costs   (9.6)
Repurchases of Common Stock (8.0) (49.3)
Dividends paid (45.2) (40.9)
Proceeds from exercise of stock options 22.8 23.6
Other financing activities (2.4) (0.8)
Net cash used by financing activities (38.0) (73.1)
Effect of exchange rate changes on cash (1.0) 0.9
Increase (decrease) in cash and cash equivalents 510.3 (44.5)
Cash and cash equivalents at beginning of period 582.9 448.4
Cash and cash equivalents at end of period 1,093.2 403.9
Supplemental disclosures:    
Cash paid for interest 22.2 34.0
Cash paid for income taxes 85.8 94.5
Cash paid for operating lease liabilities 27.2 28.3
Operating right-of-use assets obtained $ 14.0 $ 27.5