CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income	$ 84.5	$ 117.9
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization expense	41.1	35.5
Deferred income tax provision (benefit)	1.6	(1.2)
Loss (gain) on sales of property, plant and equipment	0.2	(0.1)
Equity in earnings of unconsolidated entities	(0.3)	(0.5)
Dividends received from unconsolidated entities	0.3	0.3
Share-based compensation expense	6.7	4.9
Tax deficit from share-based compensation	0.8	0.1
Net gain from life insurance policies	(2.4)	(1.2)
Changes in operating assets and liabilities (excluding effect of business acquired):
Accounts receivable	(134.8)	(143.6)
Inventories	(48.2)	(182.2)
Prepaid expenses and other assets	31.3	9.0
Accounts payable and other liabilities	91.4	97.9
Net cash provided by (used in) operating activities	72.2	(63.2)
Investing activities:
Purchases of property, plant and equipment	(26.8)	(34.6)
Acquisition of a metals service center		(10.0)
Proceeds from sales of property, plant and equipment	0.4	0.2
Net proceeds from redemptions of life insurance policies	6.9	2.8
Net cash used in investing activities	(19.5)	(41.6)
Financing activities:
Net short-term debt borrowings (repayments)	3.1	(0.4)
Proceeds from long-term debt borrowings	50.0	221.0
Principal payments on long-term debt	(110.0)	(122.2)
Payments to noncontrolling interest holders	(0.7)	(0.7)
Dividends paid	(22.9)	(11.2)
Tax deficit from share-based compensation	(0.8)	(0.1)
Exercise of stock options	31.6	4.6
Net cash (used in) provided by financing activities	(49.7)	91.0
Effect of exchange rate changes on cash	(0.5)	(0.8)
Increase (decrease) in cash and cash equivalents	2.5	(14.6)
Cash and cash equivalents at beginning of year	97.6	84.6
Cash and cash equivalents at end of period	100.1	70.0
Supplemental cash flow information:
Interest paid during the period	4.4	5.2
Income taxes paid during the period	$ 9.8	$ 32.6