Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 item	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Taxes
Effective income tax rate (as a percent)	26.10%	25.80%	27.50%	25.90%
Number of discrete tax adjustments	2
Favorable impact of percentage points that relates to the reversal of previously unrecognized tax benefits	5.30%	4.20%		2.00%
Provision for income taxes	$ 42.6	$ 30.7	$ 113.9	$ 104.1
Effective income tax rate excluding significant adjustments (as a percent)	28.00%	30.00%	28.00%	29.00%
Percentage of discrete tax benefit				1.00%
Akzo Nobel NV[Member]
Income Taxes
Percentage points that relates to unfavorable audit result related to a pre-acquisition period	4.50%
Provision for income taxes	7.0
Impact of pre-acquisition adjustment on net income	$ 0