| In millions, except per share items | Dec-31-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 8-K | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Adjustments to reconcile net income (loss) to net cash from operating activities: | | | | | | | | |
| Depreciation and amortization | | 26.1 | 25.1 | 25.3 | 25.9 | 26.0 | 26.0 | 26.4 |
| Equity in income of unconsolidated affiliates | | -40.5 | -32.5 | -40.2 | -41.7 | -36.4 | -24.9 | -14.5 |
| Distributions from unconsolidated affiliates | | | 40.6 | 31.7 | 30.2 | 25.5 | 22.0 | 17.9 |
| Stock-based compensation | | | 7.0 | 7.4 | 7.8 | 7.1 | 5.5 | 6.4 |
| Deferred income taxes | | | 10.2 | -3.0 | 5.4 | 1.7 | 5.7 | 8.1 |
| Asset impairments | | | 4.9 | 4.1 | | 11.2 | | |
| Other | | | 1.2 | -0.6 | 2.8 | 1.9 | 1.2 | 1.0 |
| Changes in operating assets and liabilities, net of businesses acquired and dispositions: | | | | | | | | |
| Income taxes | | | 6.4 | -10.9 | -15.7 | 30.3 | 9.2 | -8.4 |
| Deferred revenue | | | 56.3 | 22.3 | 1.0 | -33.6 | 21.0 | -6.4 |
| Other assets and liabilities | | | -27.4 | -11.9 | -22.0 | 85.6 | 2.2 | -43.6 |
| Cash flows from investing activities: | | | | | | | | |
| Capital maintenance expenditures | | | -10.0 | -17.2 | -8.6 | -9.0 | -4.7 | -4.8 |
| Acquisition of businesses, net of cash acquired | | | | | | | | |
| Proceeds from the Calder land sale | | | | | | | | |
| Other | | | -7.3 | -5.5 | -2.2 | -0.9 | | -2.5 |
| Net cash used in investing activities | | | -62.8 | -45.2 | -24.7 | -18.2 | -12.3 | -26.6 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Payment of dividends | | | -25.7 | | | | -24.8 | |
| Repurchase of common stock | | | -24.3 | -55.1 | -48.5 | | -193.9 | |
| Cash settlement of stock awards | | | | | | | | |
| Debt issuance costs | | | | | -0.1 | -1.0 | -5.8 | -0.3 |
| Other | | | -0.1 | -0.1 | 0.9 | -0.2 | 1.6 | -0.2 |
| Net cash provided by (used in) financing activities | | | -68.0 | -54.0 | -57.1 | 3.8 | 106.8 | -536.6 |
| |
| Cash flows from discontinued operations: | | | | | | | | |
| Supplemental disclosures of cash flow information: | | | | | | | | |
| Interest | | | 20.7 | 20.7 | 20.9 | 20.5 | 15.4 | 22.3 |
| Cash paid for income taxes | | | 0.1 | 25.4 | 36.6 | 10.3 | 0.1 | 0.2 |
| Schedule of non-cash investing and financing activities: | | | | | | | | |