Acquisitions and Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Acquisition:
Purchase price	$ 29.6		$ 83.4
Net cash paid	28.1		37.2
Goodwill recorded	7.0		9.5
Energy Equipment Group
Acquisition:
Purchase price	27.9
Net cash paid	27.9
Goodwill recorded	3.0
Construction Products Group
Acquisition:
Purchase price		2.0		2.0
Net cash paid		0		0
Goodwill recorded		0.8		0.8
Divestiture:
Proceeds	0	2.1	35.6	2.1
Gain recognized	0.1	1.5	12.5	1.5
Goodwill charged off	$ 0	$ 0.1	$ 4.8	$ 0.1