CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2014	$ 653.6	$ 0.4	$ 82.5	$ (3.3)	$ 589.5	$ (15.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common stock/equity awards	(67.0)		0.2		(67.2)
Stock options exercised	2.3		2.2	0.1
Income tax benefit from equity awards	0.1		0.1
Stock-based compensation	4.9		4.9
Comprehensive income (loss)	26.1				100.8	(74.7)
Balance at Sep. 30, 2015	$ 620.0	$ 0.4	$ 89.9	$ (3.2)	$ 623.1	$ (90.2)