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Consolidated Statements of Cash Flows
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Cash flows from operating activities:      
Net income $ 375.4 $ 350.2 $ 318.1
(Income) loss from discontinued operations, net of tax (1.1) 0.4 0.0
Adjustments to reconcile net income to net cash provided by operating activities—      
Provision for government, class action, and related settlements 52.0 0.0 0.0
Depreciation and amortization 199.7 183.8 172.6
Amortization of debt-related items 4.0 8.7 13.8
Loss on early extinguishment of debt 0.0 10.7 7.4
Equity in net income of nonconsolidated affiliates (8.7) (8.0) (9.8)
Distributions from nonconsolidated affiliates 8.3 8.6 8.5
Stock-based compensation 85.9 47.7 27.4
Deferred tax expense (9.1) 60.8 132.9
Other, net 9.2 3.4 0.1
Changes in assets and liabilities, net of acquisitions—      
Accounts receivable 7.0 (31.5) (66.3)
Prepaid expenses and other assets 11.5 (12.6) (3.3)
Accounts payable 6.6 7.5 6.3
Accrued payroll 14.8 24.4 21.4
Other liabilities 6.1 4.8 11.8
Net cash provided by (used in) operating activities of discontinued operations 0.8 (0.6) (0.7)
Total adjustments 388.1 307.7 322.1
Net cash provided by operating activities 762.4 658.3 640.2
Cash flows from investing activities:      
Acquisition of businesses, net of cash acquired (143.9) (38.8) (48.1)
Purchases of property and equipment (254.5) (225.8) (177.7)
Additions to capitalized software costs (16.0) (19.2) (25.2)
Proceeds from disposal of assets 0.4 12.3 23.9
Proceeds from sale of restricted investments 11.6 4.2 0.1
Purchases of restricted investments (13.3) (8.5) (1.3)
Other, net (8.8) (7.2) (1.7)
Net cash provided by investing activities of discontinued operations 0.0 0.0 0.1
Net cash used in investing activities (424.5) (283.0) (229.9)
Cash flows from financing activities:      
Principal payments on debt, including pre-payments (20.6) (129.9) (202.1)
Principal borrowings on notes 13.2 0.0 0.0
Borrowings on revolving credit facility 325.0 273.3 335.0
Payments on revolving credit facility (390.0) (330.3) (313.0)
Principal payments under capital lease obligations (17.9) (15.3) (13.3)
Repurchases of common stock, including fees and expenses 0.0 (38.1) (65.6)
Dividends paid on common stock (100.8) (91.5) (83.8)
Purchase of equity interests in consolidated affiliates (65.1) 0.0 0.0
Proceeds from exercising stock warrants 0.0 26.6 0.0
Distributions paid to noncontrolling interests of consolidated affiliates (75.4) (51.9) (64.9)
Taxes paid on behalf of employees for shares withheld (8.3) (19.8) (11.6)
Contributions from consolidated affiliates 12.6 20.8 3.5
Other, net 6.1 (3.8) (0.6)
Net cash used in financing activities (321.2) (359.9) (416.4)
Increase (decrease) in cash, cash equivalents, and restricted cash 16.7 15.4 (6.1)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period 116.8 101.4 107.5
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period 133.5 116.8 101.4
Reconciliation of Cash, Cash Equivalents, and Restricted Cash      
Cash and cash equivalents at beginning of period 54.4 40.5 61.6
Restricted cash at beginning of period 62.4 60.9 45.9
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period 116.8 101.4 107.5
Cash and cash equivalents at end of period 69.2 54.4 40.5
Restricted cash at end of period 59.0 62.4 60.9
Restricted cash included in other long-term assets at end of period 5.3 0.0 0.0
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period 133.5 116.8 101.4
Supplemental cash flow information:      
Interest (149.6) (150.5) (164.3)
Income tax refunds 0.6 1.9 1.4
Income tax payments (115.4) (96.4) (33.3)
Supplemental schedule of noncash financing activities:      
Conversion of convertible debt $ 0.0 $ 319.4 $ 0.0