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			67,100,000
Shares, Issued				(29,200,000)
Stockholders' Equity Attributable to Parent		$ (109.6)		$ (1,099.0)	$ 698.0	$ 2,261.7
Common Stock, Value, Issued			$ 41.6
Stock Repurchased During Period, Shares	400,000
Repurchase of common stock	$ 25.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition					1.9
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Reclassification out of Accumulated Other Comprehensive Income [Domain]	(19.4)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Retained Earnings [Member]	15.2
Stock Issued During Period, Shares, New Issues			100,000
Stock Issued During Period, Value, New Issues			$ 0.0
Net Income (Loss) Attributable to Parent	76.3
Dividends, Common Stock, Cash						17.3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	15.3
Common Stock, Shares, Issued			67,200,000
Shares, Issued				(29,600,000)
Stockholders' Equity Attributable to Parent	$ 1,839.7	(113.7)		$ (1,124.0)	699.9	2,335.9
Common Stock, Value, Issued			$ 41.6
Common Stock, Shares, Issued	67,329,081		67,300,000
Shares, Issued				(30,700,000)
Stockholders' Equity Attributable to Parent	$ 1,788.1	(164.6)		$ (1,214.5)	706.4	2,419.2
Common Stock, Value, Issued	$ 41.6		$ 41.6
Stock Repurchased During Period, Shares	500,000
Repurchase of common stock	$ 40.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition					3.1
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Reclassification out of Accumulated Other Comprehensive Income [Domain]	0.0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Retained Earnings [Member]	39.4
Stock Issued During Period, Shares, New Issues			100,000
Stock Issued During Period, Value, New Issues			$ 0.1
Net Income (Loss) Attributable to Parent	41.5
Dividends, Common Stock, Cash						17.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (5.5)
Common Stock, Shares, Issued	67,424,714		67,400,000
Shares, Issued				(31,200,000)
Stockholders' Equity Attributable to Parent	$ 1,809.2	$ (170.1)		$ (1,254.5)	$ 709.5	$ 2,482.6
Common Stock, Value, Issued	$ 41.7		$ 41.7