Consolidated Statements of Stockholders’ Equity - USD ($) $ in Millions	Total	Common Stock	Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Accumulated Deficit
Balance at start of period at Dec. 31, 2012	$ 639.2	$ 1.1	$ 2,018.5	$ (156.1)	$ (2.5)	$ (1,221.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	77.1	0.0	0.0	0.0	0.0	77.1
Income (loss) on derivative financial instrument, net of tax	0.2	0.0	0.0	0.2	0.0	0.0
Translation impact	(61.6)	0.0	0.0	(61.6)	0.0	0.0
Pension and post-retirement adjustment, net of tax	31.9	0.0	0.0	31.9	0.0	0.0
Stock-based compensation	16.4	0.0	16.4	0.0	0.0	0.0
Common stock issued, net of shares withheld for employee taxes	(1.0)	0.0	0.0	0.0	(1.0)	0.0
Other	0.1	0.0	0.1	0.0	0.0	0.0
Balance at end of period at Dec. 31, 2013	$ 702.3	$ 1.1	2,035.0	(185.6)	$ (3.5)	(1,144.7)
Balance at start of period (in shares) at Dec. 31, 2012	113,143,344	113,403,824			260,480
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes	520,512	652,592			132,080
Balance at end of period (in shares) at Dec. 31, 2013	113,663,856	114,056,416			392,560
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 91.6	$ 0.0	0.0	0.0	$ 0.0	91.6
Income (loss) on derivative financial instrument, net of tax	2.4	0.0	0.0	2.4	0.0	0.0
Translation impact	(76.4)	0.0	0.0	(76.4)	0.0	0.0
Pension and post-retirement adjustment, net of tax	(33.0)	0.0	0.0	(33.0)	0.0	0.0
Common stock repurchases	(19.4)	0.0	(19.4)	0.0	0.0	0.0
Stock-based compensation	15.7	0.0	15.7	0.0	0.0	0.0
Common stock issued, net of shares withheld for employee taxes	(2.2)	0.0	0.3	0.0	(2.5)	0.0
Other	0.0	0.0	(0.1)	0.0	0.1	0.0
Balance at end of period at Dec. 31, 2014	$ 681.0	$ 1.1	2,031.5	(292.6)	$ (5.9)	(1,053.1)
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes	1,003,076	1,369,740			366,664
Common stock repurchases	(2,755,642)	(2,755,642)			0
Balance at end of period (in shares) at Dec. 31, 2014	111,911,290	112,670,514			759,224
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 85.9	$ 0.0	0.0	0.0	$ 0.0	85.9
Income (loss) on derivative financial instrument, net of tax	(1.9)	0.0	0.0	(1.9)	0.0	0.0
Translation impact	(136.7)	0.0	0.0	(136.7)	0.0	0.0
Pension and post-retirement adjustment, net of tax	2.0	0.0	0.0	2.0	0.0	0.0
Common stock repurchases	(60.0)	(0.1)	(59.9)	0.0	0.0	0.0
Stock-based compensation	16.0	0.0	16.0	0.0	0.0	0.0
Common stock issued, net of shares withheld for employee taxes	(5.2)	0.0	0.7	0.0	(5.9)	0.0
Other	0.1	0.1	0.0	0.0	0.0	0.0
Balance at end of period at Dec. 31, 2015	$ 581.2	$ 1.1	$ 1,988.3	$ (429.2)	$ (11.8)	$ (967.2)
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes	1,419,341	2,149,165			729,824
Common stock repurchases	(7,690,628)	(7,690,628)			0
Balance at end of period (in shares) at Dec. 31, 2015	105,640,003	107,129,051			1,489,048