CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDER'S EQUITY - USD ($) shares in Millions, $ in Millions	Total	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Common Stock [Member]	Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,365.5
Common stock, shares issued	89.5
Common Stock, Value, Issued				$ 89.5
Retained earnings	$ 1,696.7
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (424.0)	$ (424.0)
Noncontrolling interests			$ 3.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Activity from Stock Incentive Plans				1.1
Share Repurchases	(2.0)			(2.2)
Activity from Stock Incentive Plans, Additional Paid in Capital	$ 28.1	0.0	0.0	$ 1.1	$ 27.0
Share Repurchases, Value	(77.8)	0.0	0.0	(2.2)	(75.6)
Net Income (Loss)	186.6	0.0	0.5	0.0	186.1
Dividends Declared	(44.6)	0.0	0.0	0.0	(44.6)
Dividend to Noncontrolling Interest	(1.9)	0.0	(1.9)	0.0	0.0
Purchase of Noncontrolling Interest	(0.4)	0.0	0.0	0.0	(0.4)
Total Other Comprehensive Income (Loss), Net of Tax	(27.2)	(27.2)	0.0	0.0	0.0
Other	0.1	0.0	0.1	$ 0.0	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,428.4
Common stock, shares issued				88.4
Common Stock, Value, Issued				$ 88.4
Retained earnings					1,789.2
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (451.2)	(451.2)
Noncontrolling interests			2.0
Activity from Stock Incentive Plans				0.7
Share Repurchases	(0.8)			(0.9)
Activity from Stock Incentive Plans, Additional Paid in Capital	$ 30.6	0.0	0.0	$ 0.7	29.9
Share Repurchases, Value	(32.9)	0.0	0.0	(0.9)	(32.0)
Net Income (Loss)	113.3	0.0	(0.2)	0.0	113.5
Cumulative Effect of Accounting Change	1.0	0.0	0.0	0.0	1.0
Dividends Declared	(45.5)	0.0	0.0	0.0	(45.5)
Total Other Comprehensive Income (Loss), Net of Tax	103.0	103.0	0.0	0.0	0.0
Other	(0.1)	0.0	(0.1)	$ 0.0	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,597.8
Common stock, shares issued	88.2			88.2
Common Stock, Value, Issued	$ 88.2			$ 88.2
Retained earnings	1,856.1				1,856.1
Accumulated Other Comprehensive Income (Loss), Net of Tax	(348.2)	(348.2)
Noncontrolling interests	$ 1.7		1.7
Activity from Stock Incentive Plans				0.5
Share Repurchases	(1.0)			(1.1)
Activity from Stock Incentive Plans, Additional Paid in Capital	$ 27.5	0.0	0.0	$ 0.5	27.0
Share Repurchases, Value	(56.1)	0.0	0.0	(1.1)	(55.0)
Net Income (Loss)	334.6	0.0	0.9	0.0	333.7
Cumulative Effect of Accounting Change	(4.1)	0.0	0.0	0.0	(4.1)
Dividends Declared	(47.4)	0.0	0.0	0.0	(47.4)
Total Other Comprehensive Income (Loss), Net of Tax	(27.3)	(27.3)	0.0	0.0	0.0
Other	(0.1)	0.0	(0.1)	$ 0.0	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,824.9
Common stock, shares issued	87.6			87.6
Common Stock, Value, Issued	$ 87.6			$ 87.6
Retained earnings	2,110.3				$ 2,110.3
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (375.5)	$ (375.5)
Noncontrolling interests			$ 2.5