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)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition					4.7
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			200,000
Stock Issued During Period, Value, New Issues			$ 0.0
Net Income (Loss) Attributable to Parent	115.1
Dividends, Common Stock, Cash						(34.7)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (31.0)
Common Stock, Shares, Issued			67,200,000
Shares, Issued				(29,600,000)
Stockholders' Equity Attributable to Parent		(113.7)		$ (1,124.0)	699.9	2,335.9
Common Stock, Value, Issued			$ 41.6
Stock Repurchased During Period, Shares	0
Repurchase of common stock	$ 0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition					2.8
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]	0.0
Stock Issued During Period, Shares, New Issues			100,000
Stock Issued During Period, Value, New Issues			$ 0.0
Net Income (Loss) Attributable to Parent	38.8
Dividends, Common Stock, Cash						(17.4)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(46.3)
Common Stock, Shares, Issued			67,300,000
Shares, Issued				(29,600,000)
Stockholders' Equity Attributable to Parent	$ 1,817.6	(160.0)		$ (1,124.0)	702.7	2,357.3
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	(1,100,000)
Repurchase of common stock	$ (83.2)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition					6.6
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			200,000
Stock Issued During Period, Value, New Issues			$ 0.2
Net Income (Loss) Attributable to Parent	109.5
Dividends, Common Stock, Cash						(34.6)
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
Stock Repurchased During Period, Shares	(600,000)
Repurchase of common stock	$ (43.2)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition					3.5
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]	0.0
Stock Issued During Period, Shares, New Issues			100,000
Stock Issued During Period, Value, New Issues			$ 0.1
Net Income (Loss) Attributable to Parent	68.0
Dividends, Common Stock, Cash						(17.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 14.3
Common Stock, Shares, Issued	67,476,417		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		$ 41.8