Revenue (Summary of Disaggregation of Revenue by Geographical Area) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 432.2	$ 350.9	$ 837.9	$ 694.7
United States
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	285.9	225.5	544.5	453.6
Europe
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	47.1	35.6	93.1	69.1
Asia
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	36.8	31.5	70.2	59.3
Mexico
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	25.1	29.0	55.8	53.2
Canada
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	34.7	26.3	69.0	54.0
Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	2.6	3.0	5.3	5.5
Supply Technologies Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	166.2	142.4	327.1	275.6
Supply Technologies Segment | United States
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	110.5	100.4	213.8	191.4
Supply Technologies Segment | Europe
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	25.6	15.9	51.6	30.7
Supply Technologies Segment | Asia
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	13.2	10.1	27.1	20.7
Supply Technologies Segment | Mexico
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	13.5	13.0	27.7	26.1
Supply Technologies Segment | Canada
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	3.4	2.8	6.8	5.9
Supply Technologies Segment | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0.0	0.2	0.1	0.8
Assembly Components
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	153.2	126.0	298.6	265.3
Assembly Components | United States
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	109.3	90.7	211.1	194.2
Assembly Components | Europe
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	1.2	0.9	2.4	1.9
Assembly Components | Asia
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	8.7	6.9	16.5	14.2
Assembly Components | Mexico
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	8.1	7.6	16.6	15.3
Assembly Components | Canada
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	25.6	19.5	51.3	38.9
Assembly Components | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0.3	0.4	0.7	0.8
Engineered Products Segment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	112.8	82.5	212.2	153.8
Engineered Products Segment | United States
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	66.1	34.4	119.6	68.0
Engineered Products Segment | Europe
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	20.3	18.8	39.1	36.5
Engineered Products Segment | Asia
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	14.9	14.5	26.6	24.4
Engineered Products Segment | Mexico
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	3.5	8.4	11.5	11.8
Engineered Products Segment | Canada
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	5.7	4.0	10.9	9.2
Engineered Products Segment | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 2.3	$ 2.4	$ 4.5	$ 3.9