Inventories (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Inventories
Finished goods	$ 131.1	$ 162.4
Work in process	186.0	177.6
Raw material and purchased parts	261.1	270.2
Total FIFO cost	578.2	610.2
Excess of FIFO cost over LIFO inventory value	(22.6)	(23.0)
Total inventories	555.6	587.2
Domestic inventories, valued using the last-in, first-out ("LIFO") method, as a percentage of total inventory	19.00%	15.00%
Progress payments, which are netted against work in process	4.1	3.7
Amount of operating income increased	$ 0.1	$ 1.2