| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Cash received from customers | | | | | | | | |
| Cash paid to suppliers and employees | | | | | | | | |
| Interest paid, net | -2.3 | -21.6 | -22.3 | -22.7 | -22.2 | -21.3 | -20.8 | -20.8 |
| Income tax payments, net | -134.7 | -65.2 | -45.1 | -62.4 | -52.1 | -38.4 | -31.7 | -28.9 |
| Investment proceeds and miscellaneous receipts, net | | 21.5 | 31.7 | 26.4 | 18.4 | 15.7 | 12.0 | 15.7 |
| Net cash provided by operating activities | 1,313.0 | 575.3 | 457.9 | 285.5 | 104.1 | 216.4 | 186.2 | 273.3 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Capital expenditures | | -98.9 | -98.5 | -129.8 | -111.3 | -141.4 | -112.0 | -121.0 |
| Payments for purchases of marketable securities and investments | | -248.5 | -371.5 | -371.0 | -282.7 | -278.1 | -294.5 | -205.7 |
| Proceeds from Sale of Debt Securities, Available-for-sale | | 89.7 | 104.6 | 77.0 | 97.5 | 76.9 | 78.7 | 75.7 |
| Proceeds from maturities of marketable securities and investments | | 278.3 | 226.9 | 225.3 | 202.2 | 143.0 | 170.8 | 120.4 |
| Net cash used in investing activities | -784.4 | -60.3 | -208.9 | -187.0 | -175.6 | -213.9 | -166.9 | -190.5 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from Debt, Net of Issuance Costs | | | | | 0.0 | 0.0 | | -1.6 |
| Payments on long-term borrowings | | -426.9 | -0.6 | -3.0 | -0.3 | -0.3 | -0.3 | -0.3 |
| Proceeds from Issuance of Common Stock | | 7.3 | 5.0 | 5.3 | 14.6 | 11.3 | 8.2 | 15.1 |
| Net cash used in financing activities | -55.4 | -523.0 | -22.8 | -48.7 | 0.3 | 9.0 | 8.6 | 11.7 |
| |
| Cash and cash equivalents | | | | | | | | |