Effect of Corrections on the Company's Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts receivable from customers	$ 451.8	$ 411.0
Inventories	1,871.3	1,763.0
Other current assets	279.1	307.5
Total current assets	2,786.8	2,889.2
Total assets	8,510.0	8,662.7
Other current liabilities	431.7	506.6
Total current liabilities	824.0	1,250.7
Total liabilities	3,634.6	4,066.9
Retained earnings	6,249.1	6,123.4
Total equity	4,875.4	4,595.8
Total liabilities and equity	8,510.0	8,662.7
As Previously Reported
Accounts receivable from customers		413.7
Inventories		1,736.9
Other current assets		305.1
Total current assets		2,863.4
Total assets		8,636.9
Other current liabilities		464.5
Total current liabilities		1,208.6
Total liabilities		4,024.8
Retained earnings		6,139.7
Total equity		4,612.1
Total liabilities and equity		8,636.9
Adjustment
Accounts receivable from customers		(2.7)
Inventories		26.1
Other current assets		2.4
Total current assets		25.8
Total assets		25.8
Other current liabilities		42.1
Total current liabilities		42.1
Total liabilities		42.1
Retained earnings		(16.3)
Total equity		(16.3)
Total liabilities and equity		25.8
As Revised
Accounts receivable from customers		411.0
Inventories		1,763.0
Other current assets		307.5
Total current assets		2,889.2
Total assets		8,662.7
Other current liabilities		506.6
Total current liabilities		1,250.7
Total liabilities		4,066.9
Retained earnings		6,123.4
Total equity		4,595.8
Total liabilities and equity		$ 8,662.7