| 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 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 772.0 | 1,775.9 | 442.8 | 400.2 | 231.4 | 189.7 | 144.0 | 145.8 |
| Depreciation and amortization [+] | 108.7 | 93.5 | 79.0 | 54.7 | 37.7 | 24.0 | 18.0 | 17.9 |
| Depreciation | 108.7 | 93.5 | 79.0 | 54.7 | 37.7 | 24.0 | 18.0 | 17.9 |
| Asset impairment charges | | | 28.5 | | | | | |
| Stock-based compensation | 114.3 | 98.4 | 88.2 | 70.8 | 58.9 | 54.1 | 52.9 | 39.8 |
| Tax benefit from stock-based compensation | | | | | | -0.9 | -0.2 | |
| Deferred taxes | 15.5 | -1,491.6 | 0.3 | -15.7 | 17.6 | -16.4 | -11.4 | 4.1 |
| Change in working capital [+] | 154.2 | 129.7 | 75.2 | 18.7 | 75.9 | -16.6 | 20.8 | 9.2 |
| Accounts receivable | -262.1 | -139.8 | -121.0 | -109.2 | -91.0 | -95.8 | -40.8 | -27.2 |
| Inventories | -112.5 | -29.1 | -58.3 | -24.1 | -5.5 | -7.7 | -3.6 | -2.0 |
| Other current assets | -124.6 | -21.1 | -31.5 | -9.1 | -8.7 | -9.4 | -3.7 | -2.9 |
| Accounts payable | 19.7 | 52.2 | 22.1 | 25.0 | 8.2 | -3.4 | 7.6 | 2.9 |
| Accrued expenses | 158.5 | 42.2 | 60.2 | 36.3 | 24.2 | 31.4 | 12.5 | 22.7 |
| Deferred revenues | 462.6 | 228.1 | 189.1 | 136.4 | 79.7 | 60.7 | 41.9 | 15.8 |
| Other | 12.4 | -2.8 | 14.6 | -36.5 | 69.0 | 7.6 | 6.9 | |
| Other operating activities | 7.8 | 56.2 | 33.3 | 25.9 | 17.1 | 13.7 | 13.8 | |
| Cash from operations | 1,172.5 | 662.2 | 747.3 | 554.7 | 438.5 | 247.7 | 238.0 | 226.9 |
| |
| Capital expenditures | -401.1 | -154.9 | -149.7 | -223.3 | -195.7 | -70.6 | -53.5 | -24.1 |
| Purchases of property and equipment | -401.1 | -154.9 | -149.7 | -223.3 | -195.7 | -70.6 | -53.5 | -24.1 |
| Acquisitions | -8.0 | -420.8 | | | -9.0 | | | |
| Sales of short-term investments, net [+] | -197.3 | 316.1 | -207.9 | 204.5 | -1.5 | 198.4 | -113.0 | -177.4 |
| Purchases of short-term investments | -200.9 | -5.3 | -693.3 | -180.2 | -390.2 | -405.6 | -447.1 | -437.2 |
| Sales of short-term investments | 3.6 | 321.5 | 485.4 | 384.7 | 388.8 | 604.0 | 334.1 | 259.8 |
| Other cash from investing | 43.0 | 28.1 | 7.1 | 25.8 | -45.4 | -54.8 | 0.0 | -0.2 |
| Cash from investing | -563.4 | -231.5 | -350.4 | 6.9 | -251.5 | 73.0 | -166.4 | -201.6 |
| |
| Repurchase of common stock, net | -349.4 | 20.3 | -382.1 | -283.4 | -89.3 | -82.4 | -90.5 | -80.2 |
| Other cash from financing | -108.9 | -51.1 | -103.4 | -86.1 | -46.2 | -13.1 | -10.3 | 13.8 |
| Cash from financing | -458.3 | -30.8 | -485.5 | -369.4 | -135.5 | -95.5 | -100.8 | -66.4 |
| |
| Free cash flow | 771.4 | 507.3 | 597.6 | 331.4 | 242.8 | 177.1 | 184.5 | 202.8 |
| Per share (diluted) | $9.68 | $6.40 | $7.46 | $4.07 | $2.97 | $2.17 | $2.26 | $2.46 |