CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) - 6 months ended Jun. 30, 2017 - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2016	$ 1,008.4	$ 0.9	$ 1,499.8	$ (360.2)	$ (132.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(32.9)			(32.9)
Other comprehensive earnings, net of tax	23.4				23.4
Stock-based compensation expense	12.4		12.4
Common stock issued for exercise of stock options			3.1
Tax on restricted stock unit vesting	(4.5)		(4.5)
Balance at Jun. 30, 2017	$ 1,009.9	$ 0.9	$ 1,510.8	$ (393.1)	$ (108.7)