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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 131.8 $ 34.3
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 116.3 146.5
Net loss on refinancing transaction 5.0 0.0
Amortization and loss on fair value of hedge instrument 0.3 1.2
Equity in net income of affiliates, net of dividends (3.2) 1.7
Deferred taxes (18.3) (4.1)
Amortization of discount and deferred financing fees 1.3 1.5
Stock-based compensation 15.9 8.9
Provision for losses on trade accounts receivable 1.8 1.8
Other (3.9) 0.9
Changes in assets and liabilities:    
Trade accounts receivable (11.4) (22.9)
Other current and long-term assets (42.2) (28.6)
Trade accounts payable 3.5 2.2
Other current and long-term liabilities (22.7) 6.1
Cash provided by operating activities 174.2 149.5
Cash flows from investing activities:    
Capital expenditures (58.0) (54.9)
Proceeds from sale of trading securities 2.5 0.9
Purchases of trading securities (1.5) (1.2)
Proceeds from sale of other investments 46.9 19.7
Purchases of other investments (36.0) (17.3)
Acquisitions and purchases of noncontrolling interests, net of cash acquired (58.7) (270.6)
Other 0.3 0.0
Cash used in investing activities (104.5) (323.4)
Cash flows from financing activities:    
Proceeds from senior secured term loan B 0.0 150.0
Proceeds from senior secured term loan A 0.0 55.0
Proceeds from senior secured revolving line of credit 105.0 145.0
Payments of senior secured revolving line of credit (60.0) (145.0)
Repayments of debt (24.9) (23.8)
Debt financing fees (5.0) (3.4)
Proceeds from issuance of common stock and exercise of stock options 16.3 2.3
Treasury stock purchased (133.5) 0.0
Excess tax benefit 0.0 2.2
Distributions to noncontrolling interests (0.3) (1.0)
Payment of contingent obligation (7.8) (0.3)
Cash (used in) provided by financing activities (110.2) 181.0
Effect of exchange rate changes on cash and cash equivalents 0.3 1.0
Net change in cash and cash equivalents (40.2) 8.1
Cash and cash equivalents, beginning of period 182.2 133.2
Cash and cash equivalents, end of period $ 142.0 $ 141.3