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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating activities:    
Net income $ 6.2 $ 69.5
Depreciation and amortization 27.0 26.6
Stock-based compensation expense 4.2 6.6
Deferred income taxes (185.1) 0.2
(Gain) loss on sale of assets (5.6) 2.7
Foreign currency transaction (gains) losses (0.9) 0.5
Other non-cash adjustments 5.8 2.6
Changes in operating assets and liabilities (14.7) 259.4
Net cash provided (used) by operating activities (163.1) 368.1
Investing activities:    
Additions to property, plant and equipment (39.4) (21.6)
Additions to equipment held for rental (3.8) (1.9)
Proceeds from sale of equipment held for rental 14.9 2.7
Other investing activities (0.4) (2.5)
Net cash used by investing activities (28.7) (23.3)
Financing activities:    
Repayments of debt (original maturities greater than three months)   (5.2)
Repurchases of Common Stock (162.0) (8.0)
Dividends paid (24.9) (22.5)
Proceeds from exercise of stock options 2.7 4.6
Other financing activities (2.1) (1.2)
Net cash used by financing activities (186.3) (32.3)
Effect of exchange rate changes on cash (2.0) 3.2
Increase (decrease) in cash and cash equivalents (380.1) 315.7
Cash and cash equivalents at beginning of period 1,375.8 582.9
Cash and cash equivalents at end of period 995.7 898.6
Supplemental disclosures:    
Cash paid for interest 12.2 10.6
Cash paid for income taxes 2.7 1.9
Proceeds from income tax refunds 7.5  
Cash paid for operating lease liabilities 12.2 13.4
Operating right-of-use assets obtained $ 20.6 $ 6.1