Discontinued Operations (Components Of Income Related To Discontinued Operations) (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Mar. 31, 2012 ASI [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 385,800,000	$ 652,600,000	$ 668,300,000
Operating expenses	(328,300,000)	(535,900,000)	(565,500,000)
Allocated interest expense	(2,000,000)	(3,600,000)	(4,000,000)
Earnings before income taxes	55,500,000	113,100,000	98,800,000
Income tax expense	(20,200,000)	(38,300,000)	(34,100,000)
Earnings from discontinued operations	35,300,000	74,800,000	64,700,000
Gain on sale, net of $126 million of related income taxes	201,700,000			93,000,000
Earnings from discontinued operations, net of income taxes	236,977,000	74,817,000	64,660,000
Income taxes related to the gain on the sale	126,000,000
Current liabilities	80,500,000	167,300,000
Non-current liabilities		8,100,000
Total liabilities	80,500,000	175,400,000
Current assets	238,000,000	530,900,000
Non-current assets		137,700,000
Total assets	$ 238,000,000	$ 668,600,000