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			15.6
Net income	$ 140.7			140.7
Dividends declared (in dollars per share)	$ 1.10
Dividends, Common Stock, Cash				(40.6)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (33.5)				(33.5)
Common stock, shares issued		68,700,000
Common Stock, Value, Issued		$ 42.4
Shares, Issued						(33,300,000)
Stockholders' Equity Attributable to Parent			(797.5)	(2,888.6)	202.1	$ (1,424.9)
Stock Issued During Period, Shares, New Issues		100,000
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			10.3
Net income	$ 63.3			63.3
Dividends declared (in dollars per share)	$ 0.55
Dividends, Common Stock, Cash				(20.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (24.0)				(24.0)
Common stock, shares issued		68,800,000
Common Stock, Value, Issued		$ 42.5
Shares, Issued						(33,300,000)
Stockholders' Equity Attributable to Parent	$ (2,178.9)		(807.8)	(2,931.6)	178.1	$ (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						(100,000)
Repurchase of common stock						$ (8.8)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			20.3
Net income	$ 118.7			118.7
Dividends declared (in dollars per share)	$ 1.16
Dividends, Common Stock, Cash				(42.8)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 17.2				17.2
Common stock, shares issued		68,900,000
Common Stock, Value, Issued		$ 42.6
Shares, Issued						(33,400,000)
Stockholders' Equity Attributable to Parent			(828.8)	(3,062.4)	177.4	$ (1,432.1)
Stock Issued During Period, Shares, New Issues		100,000
Stock Issued During Period, Value, New Issues		$ 0.1
Stock Repurchased During Period, Shares						0
Repurchase of common stock						$ (4.2)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			7.6
Net income	$ 44.4			44.4
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	$ 7.4				7.4
Common stock, shares issued	69,018,783	69,000,000.0
Common Stock, Value, Issued	$ 42.7	$ 42.7
Shares, Issued						(33,400,000)
Stockholders' Equity Attributable to Parent	$ (2,343.4)		$ (836.4)	$ (3,085.4)	$ 184.8	$ (1,436.3)