Business Combinations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	8 Months Ended		8 Months Ended	12 Months Ended		3 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Schilling Robotics	Apr. 25, 2012 Schilling Robotics	Dec. 31, 2012 CSI	Dec. 31, 2012 CSI	Apr. 30, 2012 CSI	Dec. 31, 2012 Pure Energy	Oct. 02, 2012 Pure Energy
Business Acquisition
Percentage of voting interests acquired			55.00%			100.00%		100.00%
Percentage of previously held equity interest in acquiree			45.00%
Total percentage ownership		100.00%
Previously held equity interest, fair value	$ 144.9		$ 144.9
Remeasurement gain on previously held equity interest		20.0
Period after transaction date net purchase price amount withheld may be paid to acquiree					3 years
Acquisition-related costs	1.2
Revenue of acquiree since acquisition date, actual		94.6		19.7			67.3
Net income of acquiree since acquisition date, actual		3.1		2.4			2.7
Amortization of acquired intangible assets	10.1
Inventory step up amortization		$ 10.7