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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 248.9 $ 236.0
Loss from discontinued operations, net of tax 0.2 0.3
Adjustments to reconcile net income to net cash provided by operating activities—    
Provision for doubtful accounts 42.7 46.7
Depreciation and amortization 137.2 128.8
Loss on early extinguishment of debt 10.7 7.4
Equity in net income of nonconsolidated affiliates (6.2) (7.3)
Distributions from nonconsolidated affiliates 6.6 5.9
Stock-based compensation 37.9 17.4
Deferred tax expense 51.3 110.6
Other, net 9.8 11.7
Change in assets and liabilities, net of acquisitions—    
Accounts receivable (54.2) (75.7)
Other assets (7.4) (4.4)
Accounts payable 6.1 1.9
Accrued payroll 3.1 8.7
Accrued interest payable 7.3 6.0
Other liabilities 12.5 11.8
Premium paid on redemption of bonds 0.0 (5.8)
Net cash used in operating activities of discontinued operations (0.7) (0.6)
Total adjustments 256.7 263.1
Net cash provided by operating activities 505.8 499.4
Cash flows from investing activities:    
Purchases of property and equipment (155.7) (113.9)
Additions to capitalized software costs (14.6) (17.5)
Acquisitions of businesses, net of cash acquired (36.6) (19.6)
Net change in restricted cash (9.9) (7.1)
Other, net 7.6 1.8
Net cash used in investing activities (209.2) (156.3)
Cash flows from financing activities:    
Principal payments on debt, including pre-payments (125.4) (195.2)
Borrowings on revolving credit facility 241.3 260.0
Payments on revolving credit facility (255.3) (240.0)
Repurchases of common stock, including fees and expenses (38.1) (24.1)
Dividends paid on common stock (67.0) (62.4)
Proceeds from exercising stock warrants 26.6 0.0
Distributions paid to noncontrolling interests of consolidated affiliates (38.3) (49.5)
Taxes paid on behalf of employees for shares withheld (19.8) (9.9)
Other, net 6.5 (7.2)
Net cash used in financing activities (269.5) (328.3)
Increase in cash and cash equivalents 27.1 14.8
Cash and cash equivalents at beginning of period 40.5 61.6
Cash and cash equivalents at end of period 67.6 76.4
Supplemental schedule of noncash investing and financing activity    
Conversion of convertible debt $ 319.4 $ 0.0