CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common stock	Additional paid-in capital	Retained earnings (deficit)	Accumulated other comprehensive loss
Beginning Balance at Dec. 31, 2015	$ 461.9	$ 1.2	$ 1,398.7	$ (526.0)	$ (412.0)
Balance as adjusted at Dec. 31, 2015					(412.0)
Net income	43.3			43.3
Other comprehensive income (loss), net of tax	(40.8)				(40.8)
Issuance of common stock	0.1		0.1
Dividends paid - $.60 per share, $.60 per share & $.68 per share for 2016, 2017 & 2018 respectively	(69.5)			(69.5)
Ending Balance at Dec. 31, 2016	395.0	1.2	1,398.8	(552.2)	(452.8)
Balance as adjusted at Dec. 31, 2016					(452.8)
Net income	354.5			354.5
Other comprehensive income (loss), net of tax	74.1				74.1
Issuance of common stock	0.2		0.2
Dividends paid - $.60 per share, $.60 per share & $.68 per share for 2016, 2017 & 2018 respectively	(69.5)			(69.5)
Ending Balance at Dec. 31, 2017	754.3	1.2	1,399.0	(267.2)	(378.7)
Change in accounting principle - ASU 2016-01 at Dec. 31, 2017				4.8	(4.8)
Balance as adjusted at Dec. 31, 2017	754.3	1.2	1,399.0	(262.4)	(383.5)
Net income	205.0			205.0
Other comprehensive income (loss), net of tax	(40.8)				(40.8)
Issuance of common stock	0.1		0.1
Dividends paid - $.60 per share, $.60 per share & $.68 per share for 2016, 2017 & 2018 respectively	(78.8)			(78.8)
Ending Balance at Dec. 31, 2018	$ 839.8	$ 1.2	$ 1,399.1	$ (136.2)	$ (424.3)