CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2009	$ 822.3	$ 78.7	$ 823.1	$ (248.2)	$ 168.7
Balance (in shares) at Dec. 31, 2009		78.7
Net income	64.8	0	0	0	64.8
Other comprehensive loss	(13.6)	0	0	(13.6)	0
Dividends paid:
Common stock ($0.80 per share)	(63.3)	0	0	0	(63.3)
Common stock issued for:
Stock options exercised	3.1	0.2	2.9	0	0
Stock options exercised (in shares)	0.2	0.2
Employee benefit plans	10.2	0.6	9.6	0	0
Employee benefit plans (in shares)		0.6
Other transactions	2.3	0.1	2.2	0	0
Other transactions (in shares)		0.1
Stock-based compensation	4.5	0	4.5	0	0
Balance at Dec. 31, 2010	830.3	79.6	842.3	(261.8)	170.2
Balance (in shares) at Dec. 31, 2010		79.6
Net income	241.7	0	0	0	241.7
Other comprehensive loss	(32.4)	0	0	(32.4)	0
Dividends paid:
Common stock ($0.80 per share)	(64.0)	0	0	0	(64.0)
Common stock repurchased and retired	(4.2)	(0.2)	(4.0)	0	0
Common stock repurchased and retired (in shares)	(0.2)	(0.2)
Common stock issued for:
Stock options exercised	9.3	0.5	8.8	0	0
Stock options exercised (in shares)	0.5	0.5
Other transactions	3.8	0.2	3.6	0	0
Other transactions (in shares)		0.2
Stock-based compensation	1.3	0	1.3	0	0
Balance at Dec. 31, 2011	985.8	80.1	852.0	(294.2)	347.9
Balance (in shares) at Dec. 31, 2011		80.1
Net income	149.6	0	0	0	149.6
Other comprehensive loss	(77.1)	0	0	(77.1)	0
Dividends paid:
Common stock ($0.80 per share)	(64.1)	0	0	0	(64.1)
Common stock repurchased and retired	(3.1)	(0.2)	(2.9)	0	0
Common stock repurchased and retired (in shares)	(0.2)	(0.2)
Common stock issued for:
Stock options exercised	1.4	0.1	1.3	0	0
Stock options exercised (in shares)	0.1	0.1
Other transactions	2.6	0.2	2.4	0	0
Other transactions (in shares)		0.2
Stock-based compensation	3.3	0	3.3	0	0
Balance at Dec. 31, 2012	$ 998.4	$ 80.2	$ 856.1	$ (371.3)	$ 433.4
Balance (in shares) at Dec. 31, 2012		80.2