Segment Geographic and Market Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Geographic information
Sales to unaffiliated customers shipped	$ 239.2	$ 253.5	$ 257.5	$ 235.4	$ 234.1	$ 247.9	$ 243.2	$ 218.6	$ 985.6	$ 943.8	$ 826.3
Operating profit from sales	17.5	28.1	31.1	21.4	20.4	25.8	20.9	19.0	98.1	86.1	69.0
Account receivable	202.7				204.4				202.7	204.4	189.8
Property, plant, equipment, and mineral rights and reserves	301.9				273.5				301.9	273.5	271.7
Identifiable assets	910.6				849.1				910.6	849.1	807.3
Americas [Member]
Geographic information
Sales to unaffiliated customers shipped									630.7	590.0	516.9
Operating profit from sales									65.5	57.5	45.8
Account receivable	109.9				112.3				109.9	112.3	106.0
Property, plant, equipment, and mineral rights and reserves	134.8				116.0				134.8	116.0	107.7
Identifiable assets	448.3				420.4				448.3	420.4	428.7
EMEA [Member]
Geographic information
Sales to unaffiliated customers shipped									191.6	220.1	185.6
Operating profit from sales									10.4	10.3	5.6
Account receivable	45.3				51.9				45.3	51.9	46.5
Property, plant, equipment, and mineral rights and reserves	112.3				108.7				112.3	108.7	114.3
Identifiable assets	303.3				289.4				303.3	289.4	265.5
Asia Pacific [Member]
Geographic information
Sales to unaffiliated customers shipped									163.3	133.7	123.8
Operating profit from sales									22.2	18.3	17.6
Account receivable	47.5				40.2				47.5	40.2	37.3
Property, plant, equipment, and mineral rights and reserves	54.8				48.8				54.8	48.8	49.7
Identifiable assets	$ 159.0				$ 139.3				$ 159.0	$ 139.3	$ 113.1