Acquisitions and Divestitures (Assets Acquired and Liability Assumed - Alcon Cable) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 04, 2012
Business Acquisition [Line Items]
Intangible assets	$ 64.4	$ 52.1
Goodwill	26.1	184.6	187.6
Alcan Cable [Member] | North America [Member]
Business Acquisition [Line Items]
Cash				0
Accounts receivable				74.7	[1],[2]
Inventories				70.7	[2]
Property, plant and equipment				72.7
Intangible assets				5.9
Goodwill				3.5	[2]
Other current and noncurrent assets				2.2
Total Assets				229.7
Current liabilities				57.1	[2]
Other liabilities				1.3
Total liabilities				58.4
Adjustments to goodwill and other working capital				$ 4.3

[1] Accounts receivable is gross contractual value. As of the acquisition date, the fair value of accounts receivable approximated carrying value.

[2] Final purchase price accounting includes immaterial adjustments to Goodwill and other working capital accounts of approximately $4.3 million.