CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Common Shares Issued At Par Value [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interest [Member]
Balance, beginning of period at Dec. 31, 2014	$ 1,070.6	$ 72.4	$ 249.2	$ 1,522.0	$ (298.8)	$ (485.1)	$ 1,059.8	$ 10.8
Net income	230.0			228.9			228.9	1.1
Cash dividends	(76.6)			(76.6)			(76.6)
Stock Repurchased During Period, Value	(25.0)					25.0	25.0
Exercise of stock options, net of shares reacquired	11.1					11.1	11.1
Stock option amortization	7.8		7.8				7.8
Tax benefit — stock options and restricted stock	0.1		0.1				0.1
Restricted stock, net	11.3		6.5			4.8	11.3
Changes in pension and postretirement plan assets and benefit obligation, net of tax	(8.4)				(8.4)		(8.4)
Currency translation adjustment	(70.1)				(69.6)		(69.6)	(0.5)
Balance, end of period at Dec. 31, 2015	1,150.8	72.4	263.6	1,674.3	(376.7)	(494.2)	1,139.4	11.4
Net income	123.8			122.8			122.8	1.0
Cash dividends	(77.2)			(77.2)			(77.2)
Exercise of stock options, net of shares reacquired	30.4					30.4	30.4
Stock option amortization	6.3		6.3				6.3
Restricted stock, net	11.5		7.0			4.5	11.5
Changes in pension and postretirement plan assets and benefit obligation, net of tax	(35.2)				(35.2)		(35.2)
Currency translation adjustment	(64.7)				(64.2)		(64.2)	(0.5)
Balance, end of period at Dec. 31, 2016	1,145.7	72.4	276.9	1,719.9	(476.1)	(459.3)	1,133.8	11.9
Net income	172.5			171.8			171.8	0.7
Cash dividends	(78.4)			(78.4)			(78.4)
Stock Repurchased During Period, Value	(25.0)					25.0	25.0
Exercise of stock options, net of shares reacquired	30.6					30.6	30.6
Stock option amortization	6.1		6.1				6.1
Restricted stock, net			8.7			1.6	10.3
Changes in pension and postretirement plan assets and benefit obligation, net of tax	9.2				9.2		9.2
Currency translation adjustment	86.9				86.8		86.8	0.1
Balance, end of period at Dec. 31, 2017	$ 1,348.5	$ 72.4	$ 291.7	$ 1,813.3	$ (380.1)	$ (452.1)	$ 1,345.2	$ 3.3