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, 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) income	(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) income	(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
Net income	178.6	0	0	0	178.6
Other comprehensive (loss) income	6.2	0	0	6.2	0
Dividends paid:
Common stock ($0.80 per share)	(64.0)	0	0	0	(64.0)
Common stock repurchased and retired	(36.2)	(1.5)	(34.7)	0	0
Common stock repurchased and retired (in shares)	(1.5)	(1.5)
Common stock issued for:
Stock options exercised	9.7	0.5	9.2	0	0
Stock options exercised (in shares)	0.5	0.5
Other Transactions	3.2	0.2	3.0	0	0
Other Transactions (in shares)		0.2
Stock-based compensation	5.2	0	5.2	0	0
Balance at Dec. 31, 2013	$ 1,101.1	$ 79.4	$ 838.8	$ (365.1)	$ 548.0
Balance (in shares) at Dec. 31, 2013		79.4