Acquisitions (Final Purchase Price Allocation For Acquisitions) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Acquisitions [Abstract]
Accounts receivable	$ 6.0
Inventories	2.3
Prepaid expenses and other current assets	0.4
Property, plant and equipment and other long-term assets	16.8
Amortizable intangible assets	16.2
Goodwill	117.8
Accounts payable and accrued liabilities	(8.2)
Other noncurrent liabilities	(2.9)
Deferred taxes-net	14.2
Total purchase price-net of cash acquired	162.6
Less: fair value of Company's previously-held investments in Helium	13.9
Less: fair value of contingent consideration	6.8
Net cash paid	$ 141.9