Impairment and Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Impairment and Restructuring Charges for the Mobile Segment
Impairment charges	$ 0.7																$ 0.7		$ 6.6		$ 0.5
Severance expense and related benefit costs	6.0		3.2		6.0						1.3		16.5				16.3		18.4		0.1
Exit costs	1.9		0.5		0.7						4.2		0.2				(0.6)		4.5		13.8
Total	4.8	[1]	3.7	[1]	6.7	[1]	1.2	[1]	0.7	[2]	11.9	[2]	16.7	[2]	0.2	[2]	16.4	[1]	29.5	[2]	14.4
Mobile Industries [Member]
Impairment and Restructuring Charges for the Mobile Segment
Impairment charges																	0		6.5		0.2
Severance expense and related benefit costs																	12.5		16.8		0.2
Exit costs																	(1.5)		4.2		13.0
Total																	11.0		27.5		13.4
Process Industries [Member]
Impairment and Restructuring Charges for the Mobile Segment
Impairment charges																	0.1		0.1		0.3
Severance expense and related benefit costs																	2.6		1.6		(0.1)
Exit costs																	0.9		0.3		0.3
Total																	3.6		2.0		0.5
Aerospace and Defense [Member]
Impairment and Restructuring Charges for the Mobile Segment
Impairment charges																	0		0
Severance expense and related benefit costs																	1.2		0		0
Exit costs																	0		0		0.5
Total																	1.2		0		0.5
Steel [Member]
Impairment and Restructuring Charges for the Mobile Segment
Impairment charges																	0.6		0		0
Severance expense and related benefit costs																	0		0
Exit costs																	0		0		0
Total																	$ 0.6		$ 0		$ 0

[1] Impairment and restructuring charges for the second quarter of 2013 included severance and related benefit costs of $6.0 million, including pension settlement costs of $5.2 million, and exit costs of $0.7 million. Impairment and restructuring charges for the third quarter of 2013 included severance and related benefit costs of $3.2 million, including pension settlement costs of $1.5 million, and exit costs of $0.5 million. Impairment and restructuring charges for the fourth quarter of 2013 included severance and related benefit costs of $6.0 million, including pension settlement costs of $0.4 million, impairment charges of $0.7 million and a favorable adjustment for exit costs of $1.9 million.

[2] Impairment and restructuring charges for the second quarter of 2012 included severance and related benefit costs of $16.5 million, including a curtailment of pension benefits of $10.7 million, and exit costs of $0.2 million. Impairment and restructuring charges for the third quarter of 2012 included impairment charges of $6.4 million, severance and related benefit costs of $1.3 million and exit costs of $4.2 million.