Acquisitions Acquisitions (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 778.3	$ 632.1	$ 659.8
Wolverine Advanced Materials Acquisition [Member]
Business Acquisition [Line Items]
Cash	8.5
Receivables	31.6
Inventory	34.4
Plant, property and equipment	22.8
Goodwill	161.6
Other intangible assets	89.0
Other assets	3.4
Accounts payable and accrued liabilities	(21.3)
Postretirement liabilities	(14.6)
Other liabilities	(8.8)
Net assets acquired	306.6
Hartzell Aerospace Acquisition [Member]
Business Acquisition [Line Items]
Cash	0.0
Receivables	5.3
Inventory	4.8
Plant, property and equipment	2.6
Goodwill	13.3
Other intangible assets	28.6
Other assets	0.9
Accounts payable and accrued liabilities	(2.6)
Postretirement liabilities	0.0
Other liabilities	0.0
Net assets acquired	$ 52.9