Revenue (Summary of Disaggregation of Revenue by Product Line) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 420.1	$ 405.7
Supply Technologies Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	165.3	160.9
Assembly Components Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	138.3	145.4
Engineered Products Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	116.5	99.4
Supply Technologies | Supply Technologies Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	144.8	138.8
Engineered specialty fasteners and other products | Supply Technologies Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	20.5	22.1
Fuel, rubber and plastic products | Assembly Components Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	89.6	99.2
Aluminum products | Assembly Components Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	48.7	46.2
Industrial equipment | Engineered Products Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	80.6	74.5
Forged and machined products | Engineered Products Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 35.9	$ 24.9