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Stock based compensation plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Y	Dec. 31, 2011	Dec. 31, 2010
Share-based compensation arrangement by share-based payment award [Line Items]
Share-based compensation arrangement, number of shares available for grant	6.2
Share-based compensation expense	$ 4.0	$ 3.5	$ 3.4
Income taxes on share - based compensation expense	2.5	2.2	2.1
Share based compensation nonvested awards total compensation cost not yet recognized	$ 5.6
Share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition	1.5

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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