Consolidated Statements of Changes in Total Equity - USD ($) shares in Thousands, $ in Millions	Total	Total GCC Equity	Common Stock	Add’l Paid in Capital	Treasury Stock	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning Balance at Dec. 31, 2014	$ 513.2	$ 452.1	$ 0.6	$ 714.8	$ (184.3)	$ 184.4	$ (263.4)	$ 61.1
Beginning Balance, shares at Dec. 31, 2014			48,683
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(220.9)	(198.7)				(121.9)	(76.8)	(22.2)
Common stock dividend	(35.3)	(35.3)				(35.3)
Sale of subsidiaries - noncontrolling interest	(21.5)	0.0						(21.5)
Stock option and RSU expense	7.5	7.5		7.5
Exercise of stock options	0.2	0.2		(0.1)	0.3
Exercise of stock options, shares			18
Treasury shares related to nonvested stock vesting	(0.7)	(0.7)			(0.7)
Treasury shares related to nonvested stock vesting, shares			(56)
Excess tax benefits (deficiencies) from stock-based compensation	(1.7)	(1.7)		(1.7)
Dividends paid to noncontrolling interest	(2.5)							(2.5)
Other	4.6	4.6			4.6
Other, shares			263
Ending Balance at Dec. 31, 2015	242.9	228.0	$ 0.6	720.5	(180.1)	27.2	(340.2)	14.9
Ending Balance, shares at Dec. 31, 2015			48,908
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(39.0)	(40.0)				(93.8)	53.8	1.0
Common stock dividend	(35.6)	(35.6)				(35.6)
Stock option and RSU expense	5.4	5.4		5.4
Exercise of stock options	1.2	1.2		0.1	1.1
Exercise of stock options, shares			60
Excess tax benefits (deficiencies) from stock-based compensation	(5.0)	(5.0)		(5.0)
Dividends paid to noncontrolling interest	(0.1)	0.0						(0.1)
Other	(0.9)	(0.9)		(10.0)	9.1
Other, shares			423
Ending Balance at Dec. 31, 2016	168.9	153.1	$ 0.6	711.0	(169.9)	(102.2)	(286.4)	15.8
Ending Balance, shares at Dec. 31, 2016			49,391
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	12.2	(1.0)				(56.6)	55.6	13.2
Common stock dividend	(37.4)	(37.4)				(37.4)
Sale of subsidiaries - noncontrolling interest	(26.4)	0.0						(26.4)
Stock option and RSU expense	10.6	10.6		10.6
Exercise of stock options	10.0	10.0		1.5	8.5
Exercise of stock options, shares			470
Excess tax benefits (deficiencies) from stock-based compensation	(0.7)
Other	(6.1)	(6.1)		(16.5)	9.5	0.9
Other, shares			723
Ending Balance at Dec. 31, 2017	$ 131.8	$ 129.2	$ 0.6	$ 706.6	$ (151.9)	$ (195.3)	$ (230.8)	$ 2.6
Ending Balance, shares at Dec. 31, 2017			50,584