CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 66.9	$ 60.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	43.7	42.1
Amortization	1.3	2.1
Stock-based compensation	9.5	20.8
Non-cash restructuring charges	15.0	0.0
Other non-cash items, net	3.3	(1.6)
Changes in assets and liabilities	(60.5)	(48.5)
Net cash provided by operating activities	79.2	75.6
Cash flows from investing activities:
Capital expenditures	(74.0)	(57.1)
Purchase of cost-method investment	(8.4)	0.0
Other, net	1.2	1.0
Net cash used in investing activities	(81.2)	(56.1)
Cash flows from financing activities:
Borrowings under revolving credit agreements	0.0	43.6
Repayments under revolving credit agreements	0.0	(43.6)
Repayments of long-term debt	(68.6)	(1.2)
Dividend payments	(17.5)	(15.8)
Excess tax benefit from employee stock plans	13.1	3.5
Shares purchased under share repurchase program	(17.2)	0.0
Shares repurchased for employee tax withholdings	(3.7)	(5.6)
Proceeds from exercise of stock options and stock appreciation rights	19.7	8.2
Employee stock purchase plan contributions	1.7	1.5
Contingent consideration payments	0.0	(0.1)
Net cash used in financing activities	(72.5)	(9.5)
Effect of exchange rates on cash	2.6	(13.3)
Net decrease in cash and cash equivalents	(71.9)	(3.3)
Cash and cash equivalents at beginning of period	274.6	255.3
Cash and cash equivalents at end of period	$ 202.7	$ 252.0