Acquisitions Acquisitions (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 944.8	$ 927.2	$ 875.9
Rheinhutte Pumpen Group [Member]
Business Acquisition [Line Items]
Cash	4.7
Receivables	12.1
Inventory	15.2
Plant, property and equipment	19.9
Goodwill	37.6
Other intangible assets	15.2
Other assets	3.8
Accounts payable and accrued liabilities	(6.7)
Other liabilities	(5.3)
Net assets acquired	96.5
Matrix Composites [Member]
Business Acquisition [Line Items]
Cash	0.5
Receivables	1.1
Inventory	1.8
Plant, property and equipment	2.9
Goodwill	14.3
Other intangible assets	8.5
Other assets	1.9
Accounts payable and accrued liabilities	(2.0)
Other liabilities	(2.7)
Net assets acquired	$ 26.3