| In millions, except per share items | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Cash Flows From Operating Activities: | | | | | | | | |
| Net income | 119.9 | 117.0 | 118.4 | 116.9 | 104.8 | 106.8 | 108.8 | 120.8 |
| Adjustments to reconcile net income to cash provided by operating activities: | | | | | | | | |
| Depreciation | 37.4 | 36.5 | 34.9 | 37.2 | 35.2 | 34.6 | 33.8 | 37.4 |
| Stock-based compensation | 7.1 | 6.4 | | 7.5 | 3.9 | 1.2 | 1.9 | 3.1 |
| Pension and other post-retirement benefits expense | | | 0.9 | 2.9 | | | 5.9 | 6.1 |
| Deferred income taxes | | | -2.7 | | | | | |
| Other | 5.7 | 4.4 | 3.7 | -0.5 | 3.0 | 3.8 | 4.7 | 14.3 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Trade receivables, net and contract assets | -68.1 | -55.8 | -29.2 | -8.1 | 6.2 | 67.9 | 62.5 | 51.9 |
| Inventories | -105.2 | -84.2 | -37.9 | 3.0 | 30.4 | 45.9 | 44.0 | 27.2 |
| Accounts payable, trade and other | 41.5 | 55.7 | 39.6 | 25.6 | 22.8 | -13.6 | -61.0 | -37.5 |
| Advance and progress payments | 76.0 | 72.0 | 54.9 | 44.6 | 38.0 | 37.4 | | |
| Accrued pension and other post-retirement benefits, net | -15.3 | -14.9 | -13.1 | -24.2 | -12.6 | -12.5 | -12.5 | -1.4 |
| Other assets and liabilities, net | 1.1 | 1.9 | 7.8 | -1.5 | -4.1 | -2.1 | -10.0 | -30.0 |
| Cash provided by operating activities | 140.2 | 179.1 | 225.7 | 254.2 | 281.3 | 323.9 | 252.0 | 236.4 |
| |
| Cash Flows From Investing Activities: | | | | | | | | |
| Acquisitions, net of cash acquired | | -209.0 | -224.5 | -185.3 | | -20.4 | | |
| Capital expenditures | -78.2 | -71.9 | -54.1 | -45.5 | -38.4 | -34.0 | -34.3 | -31.4 |
| Cash required by investing activities | -282.6 | -275.7 | -272.9 | -228.5 | -52.8 | -53.1 | -37.3 | -31.4 |
| |
| Cash Flows From Financing Activities: | | | | | | | | |
| Net proceeds from short-term debt | | | -4.3 | | -1.8 | | | |
| Net proceeds (payments) from domestic credit facilities, net of debt issuance costs | 0.9 | | | | -71.8 | | -193.9 | |
| Proceeds from issuance of 2026 convertible senior notes, net of issuance costs | | | | | 392.2 | | | |
| Proceeds from sale of warrants | | | | | 29.5 | | | |
| Settlement of taxes withheld on equity compensation awards | -1.4 | | -2.2 | -2.1 | -2.0 | | | |
| Repurchase of common stock | -2.3 | | | | | | | |
| Dividends | -13.2 | -12.8 | -12.8 | -12.8 | -12.8 | -12.8 | -12.8 | -12.7 |
| Cash provided (required) by financing activities | 11.7 | 123.2 | 80.8 | -19.2 | -87.4 | -291.7 | -207.4 | -202.3 |
| Effect of foreign exchange rate changes on cash and cash equivalents | -3.5 | 0.1 | | 1.1 | 3.2 | 3.0 | 0.7 | -1.2 |
| |
| Supplemental Cash Flow Information: | | | | | | | | |
| Non-cash investing in capital expenditures, accrued but not paid | 14.9 | 6.1 | | | 0.2 | 0.1 | | |