Consolidated Statements of Changes in Shareholders' Equity Statement - USD ($) $ in Millions	Total	AOCI Attributable to Parent [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
Common Stock, Shares, Issued			67,300,000
Shares, Issued				(30,700,000)
Stockholders' Equity Attributable to Parent		$ (164.6)		$ (1,214.5)	$ 706.4	$ 2,419.2
Common Stock, Value, Issued			$ 41.6
Dividends Declared [Table Text Block]	.92
Stock Repurchased During Period, Shares	(1,100,000)
Repurchase of common stock	$ (83.2)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition					6.6
Stock Issued During Period, Shares, New Issues			200,000
Stock Issued During Period, Value, New Issues			$ 0.2
Net income	109.5
Dividends, Common Stock, Cash						(34.6)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Retained Earnings | Retained Earnings [Member]	39.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (8.8)
Common Stock, Shares, Issued			67,400,000
Shares, Issued				(31,200,000)
Stockholders' Equity Attributable to Parent		(170.1)		$ (1,254.5)	709.5	2,482.6
Common Stock, Value, Issued			$ 41.7
Dividends Declared [Table Text Block]	.46
Stock Repurchased During Period, Shares	(600,000)
Repurchase of common stock	$ (43.2)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition					3.5
Stock Issued During Period, Shares, New Issues			100,000
Stock Issued During Period, Value, New Issues			$ 0.1
Net income	68.0
Dividends, Common Stock, Cash						(17.1)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Retained Earnings | Retained Earnings [Member]	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(14.3)
Common Stock, Shares, Issued			67,500,000
Shares, Issued				(31,800,000)
Stockholders' Equity Attributable to Parent	$ 1,834.8	(155.8)		$ (1,297.7)	713.0	2,533.5
Common Stock, Value, Issued			$ 41.8
Common Stock, Shares, Issued	67,536,794		67,500,000
Shares, Issued				(32,700,000)
Stockholders' Equity Attributable to Parent	$ 1,835.1	(163.6)		$ (1,364.5)	720.1	2,601.3
Common Stock, Value, Issued	$ 41.8		$ 41.8
Dividends Declared [Table Text Block]	.96
Stock Repurchased During Period, Shares	0
Repurchase of common stock	$ 0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition					8.7
Stock Issued During Period, Shares, New Issues			200,000
Stock Issued During Period, Value, New Issues			$ 0.0
Net income	85.6
Dividends, Common Stock, Cash						(35.2)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Retained Earnings | Retained Earnings [Member]	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 18.9
Common Stock, Shares, Issued			67,600,000
Shares, Issued				(32,700,000)
Stockholders' Equity Attributable to Parent		(201.7)		$ (1,364.5)	725.4	2,630.0
Common Stock, Value, Issued			$ 41.8
Dividends Declared [Table Text Block]	.48
Stock Repurchased During Period, Shares	0
Repurchase of common stock	$ 0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition					3.4
Stock Issued During Period, Shares, New Issues			100,000
Stock Issued During Period, Value, New Issues			$ 0.0
Net income	39.3
Dividends, Common Stock, Cash						(17.6)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Retained Earnings | Retained Earnings [Member]	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (19.2)
Common Stock, Shares, Issued	67,666,171		67,700,000
Shares, Issued				(32,700,000)
Stockholders' Equity Attributable to Parent	$ 1,875.3	$ (182.5)		$ (1,364.5)	$ 728.8	$ 2,651.7
Common Stock, Value, Issued	$ 41.8		$ 41.8