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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income $ 95.7 $ 88.7
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 63.9 59.9
Amortization 4.1 3.2
Loss on debt extinguishment 0 0.2
Stock-based compensation 12.5 15.6
Other non-cash items, net (3.1) (4.0)
Changes in assets and liabilities (36.2) (11.9)
Net cash provided by operating activities 136.9 151.7
Cash flows from investing activities:    
Capital expenditures (84.8) (113.1)
Purchases of short-term investments (9.3) (13.3)
Sales and maturities of short-term investments 16.8 18.3
Other, net (0.4) (2.9)
Net cash used in investing activities (77.7) (111.0)
Cash flows from financing activities:    
Borrowings under revolving credit agreements 222.4 249.8
Repayments under revolving credit agreements (242.4) (241.3)
Issuance of long-term debt 0 43.3
Repayments of long-term debt (1.7) (29.9)
Dividend payments (21.2) (19.7)
Excess tax benefit from employee stock plans 5.5 4.4
Shares repurchased for employee tax withholdings (4.1) (5.2)
Proceeds from exercise of stock options and stock appreciation rights 10.5 15.1
Employee stock purchase plan contributions 2.2 1.9
Contingent consideration payments (0.2) 0
Net cash (used in) provided by financing activities (29.0) 18.4
Effect of exchange rates on cash (13.4) 0.7
Net increase in cash and cash equivalents 16.8 59.8
Cash and cash equivalents at beginning of period 230.0 161.9
Cash and cash equivalents at end of period $ 246.8 $ 221.7