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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 163.8 $ 157.9
Loss from discontinued operations, net of tax 0.1 0.2
Adjustments to reconcile net income to net cash provided by operating activities—    
Provision for doubtful accounts 30.1 31.9
Depreciation and amortization 91.0 85.3
Loss on early extinguishment of debt (10.4) (4.8)
Equity in net income of nonconsolidated affiliates (4.1) (4.8)
Distributions from nonconsolidated affiliates 4.4 3.0
Stock-based compensation 28.7 13.1
Deferred tax expense 44.2 73.2
Other, net 6.4 6.9
Change in assets and liabilities, net of acquisitions—    
Accounts receivable (26.5) (59.5)
Other assets (22.0) (4.3)
Accounts payable (0.4) 1.2
Accrued payroll (0.5) 19.2
Other liabilities 7.0 (1.9)
Premium paid on redemption of bonds 0.0 (3.9)
Net cash used in operating activities of discontinued operations (0.6) (0.5)
Total adjustments 168.1 163.7
Net cash provided by operating activities 332.0 321.8
Cash flows from investing activities:    
Purchases of property and equipment (99.9) (71.4)
Additions to capitalized software costs (9.7) (15.2)
Acquisitions of businesses, net of cash acquired (20.9) (9.4)
Net change in restricted cash (12.1) (11.5)
Other, net 11.0 2.0
Net cash used in investing activities (131.6) (105.5)
Cash flows from financing activities:    
Principal payments on debt, including pre-payments (13.4) (112.8)
Borrowings on revolving credit facility 105.0 165.0
Payments on revolving credit facility (187.0) (145.0)
Repurchases of common stock, including fees and expenses (18.1) (24.1)
Dividends paid on common stock (43.5) (41.9)
Proceeds from exercising stock warrants 26.6 0.0
Distributions paid to noncontrolling interests of consolidated affiliates (24.1) (33.6)
Taxes paid on behalf of employees for shares withheld (19.8) (9.9)
Other, net 4.5 (5.3)
Net cash used in financing activities (169.8) (207.6)
Increase in cash and cash equivalents 30.6 8.7
Cash and cash equivalents at beginning of period 40.5 61.6
Cash and cash equivalents at end of period 71.1 70.3
Supplemental schedule of noncash investing and financing activity    
Conversion of convertible debt $ 319.4 $ 0.0