Consolidated Statements of Changes in Shareholders' Equity Statement - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common
Common stock, shares issued		68,600,000
Common Stock, Value, Issued		$ 42.4
Shares, Issued						(33,300,000)
Stockholders' Equity Attributable to Parent			$ (792.2)	$ (2,831.5)	$ 211.6	$ (1,424.9)
Stock Issued During Period, Shares, New Issues		200,000
Stock Issued During Period, Value, New Issues		$ 0.1
Stock Repurchased During Period, Shares						0
Repurchase of common stock						$ 0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			20.9
Net income	$ 193.2			193.2
Dividends declared (in dollars per share)	$ 1.65
Dividends, Common Stock, Cash				(61.0)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 8.3				8.3
Common stock, shares issued		68,800,000
Common Stock, Value, Issued		$ 42.5
Shares, Issued						(33,300,000)
Stockholders' Equity Attributable to Parent			(807.8)	(2,931.6)	178.1	$ (1,424.9)
Stock Issued During Period, Shares, New Issues		0
Stock Issued During Period, Value, New Issues		$ 0.0
Stock Repurchased During Period, Shares						0
Repurchase of common stock						$ 0.0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			5.3
Net income	$ 52.5			52.5
Dividends declared (in dollars per share)	$ 0.55
Dividends, Common Stock, Cash				(20.4)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 41.8				41.8
Common stock, shares issued		68,800,000
Common Stock, Value, Issued		$ 42.5
Shares, Issued						(33,300,000)
Stockholders' Equity Attributable to Parent	$ (2,174.5)		(813.1)	(2,963.7)	219.9	$ (1,424.9)
Common stock, shares issued	68,797,027	68,800,000
Common Stock, Value, Issued	$ 42.5	$ 42.5
Shares, Issued						(33,300,000)
Stockholders' Equity Attributable to Parent	(2,273.0)		(816.1)	(3,009.5)	167.6	$ (1,427.5)
Stock Issued During Period, Shares, New Issues		200,000
Stock Issued During Period, Value, New Issues		$ 0.2
Stock Repurchased During Period, Shares						(200,000)
Repurchase of common stock						$ (21.8)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			24.8
Net income	$ 207.7			207.7
Dividends declared (in dollars per share)	$ 1.74
Dividends, Common Stock, Cash				(64.2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (17.0)				(17.0)
Common stock, shares issued		69,000,000.0
Common Stock, Value, Issued		$ 42.7
Shares, Issued						(33,400,000)
Stockholders' Equity Attributable to Parent			(836.4)	(3,085.4)	184.8	$ (1,436.3)
Stock Issued During Period, Shares, New Issues		0
Stock Issued During Period, Value, New Issues		$ 0.0
Stock Repurchased During Period, Shares						(100,000)
Repurchase of common stock						$ (13.0)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			4.5
Net income	$ 89.0
Dividends declared (in dollars per share)	$ 0.58
Dividends, Common Stock, Cash				(21.4)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (34.2)				(34.2)
Common stock, shares issued	69,037,897	69,000,000.0
Common Stock, Value, Issued	$ 42.7	$ 42.7
Shares, Issued						(33,500,000)
Stockholders' Equity Attributable to Parent	$ (2,436.7)		$ (840.9)	$ (3,153.0)	$ 150.6	$ (1,449.3)