CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 31.7	$ 29.2
Depreciation	19.4	17.5
Amortization	1.1	1.1
Loss on debt extinguishment	0.2	0
Asset impairment charges	0	0.2
Other non-cash items, net	4.3	2.1
Changes in assets and liabilities	(37.8)	(36.3)
Net cash provided by operating activities	18.9	13.8
Cash flows from investing activities:
Capital expenditures	(61.7)	(32.4)
Acquisition of patents and other long-term assets	(0.7)	0
Purchases of short-term investments	(5.4)	(4.6)
Sales and maturities of short-term investments	9.6	4.8
Other, net	0.5	0.3
Net cash used in investing activities	(57.7)	(31.9)
Cash flows from financing activities:
Borrowings under revolving credit agreements, net	43.3	29.3
Repayments of long-term debt	(28.9)	(0.1)
Issuance of long-term debt	43.3	0
Dividend payments	(6.5)	(6.1)
Excess tax benefit from employee stock plans	1.1	0.3
Shares repurchased for employee tax withholdings	(2.9)	(0.6)
Proceeds from stock option exercises	5.5	0.8
Employee stock purchase plan contributions	0.6	0.6
Net cash provided by financing activities	55.5	24.2
Effect of exchange rates on cash	(3.6)	2.3
Net increase in cash and cash equivalents	13.1	8.4
Cash, including cash equivalents at beginning of period	161.9	91.8
Cash, including cash equivalents at end of period	$ 175.0	$ 100.2