CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDER'S EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,077.8
Common stock, shares issued		87.8
Common Stock, Value, Issued		$ 87.8
Retained earnings	2,372.4
Accumulated Other Comprehensive Income (Loss), Net of Tax	(385.3)			$ (385.3)
Noncontrolling interests					$ 2.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Activity from Stock Incentive Plans		0.6
Share Repurchases		(1.7)
Activity from Stock Incentive Plans, Additional Paid in Capital	17.7	$ 0.6	$ 17.1	0.0	0.0
Share Repurchases, Value	(73.2)	(1.7)	(71.5)	0.0	0.0
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	11.0	$ 0.2	10.8	0.0	0.0
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		(0.2)
Cumulative adjustment for accounting change	(1.2)	$ 0.0	(1.2)	0.0	0.0
Net Income (Loss)	73.9	0.0	72.5	0.0	1.4
Dividends Declared	(58.9)	0.0	(58.9)	0.0	0.0
Dividend to Noncontrolling Interest	(0.9)	0.0	0.0	0.0	(0.9)
Purchase of noncontrolling interest	(2.2)	0.0	(0.3)	0.0	(1.9)
Total Other Comprehensive Income (Loss), Net of Tax	105.9	$ 0.0	0.0	105.9	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,127.9
Common stock, shares issued		86.5
Common Stock, Value, Issued		$ 86.5
Retained earnings			2,319.3
Accumulated Other Comprehensive Income (Loss), Net of Tax	(279.4)			(279.4)
Noncontrolling interests					1.5
Activity from Stock Incentive Plans		0.3
Share Repurchases		(1.2)
Activity from Stock Incentive Plans, Additional Paid in Capital	17.7	$ 0.3	17.4	0.0	0.0
Share Repurchases, Value	(104.8)	(1.2)	(103.6)	0.0	0.0
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	11.7	$ 0.1	11.6	0.0	0.0
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		(0.1)
Net Income (Loss)	321.0	$ 0.0	316.3	0.0	4.7
Dividends Declared	(76.2)	0.0	(76.2)	0.0	0.0
Dividend to Noncontrolling Interest	(1.4)	0.0	0.0	0.0	(1.4)
Total Other Comprehensive Income (Loss), Net of Tax	(41.9)	0.0	0.0	(41.9)	0.0
Other	0.1	$ 0.0	0.0	0.0	0.1
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,230.7
Common stock, shares issued	85.5	85.5
Common Stock, Value, Issued	$ 85.5	$ 85.5
Retained earnings	2,461.6		2,461.6
Accumulated Other Comprehensive Income (Loss), Net of Tax	(321.3)			(321.3)
Noncontrolling interests	4.9				4.9
Activity from Stock Incentive Plans		0.3
Share Repurchases		(3.0)
Activity from Stock Incentive Plans, Additional Paid in Capital	20.0	$ 0.3	19.7	0.0	0.0
Share Repurchases, Value	(245.3)	(3.0)	(242.3)	0.0	0.0
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	8.8	$ 0.1	8.7	0.0	0.0
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		(0.1)
Net Income (Loss)	369.4	$ 0.0	367.0	0.0	2.4
Dividends Declared	(87.7)	0.0	(87.7)	0.0	0.0
Dividend to Noncontrolling Interest	(0.5)	0.0	0.0	0.0	(0.5)
Acquisition of noncontrolling interest	2.7	0.0	0.0	0.0	2.7
Total Other Comprehensive Income (Loss), Net of Tax	(23.0)	0.0	0.0	(23.0)	0.0
Other	(0.1)	$ 0.0	0.1	0.0	(0.2)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,257.4
Common stock, shares issued	82.7	82.7
Common Stock, Value, Issued	$ 82.7	$ 82.7
Retained earnings	2,509.7		$ 2,509.7
Accumulated Other Comprehensive Income (Loss), Net of Tax	(344.3)			$ (344.3)
Noncontrolling interests	$ 9.3				$ 9.3