Consolidated Statement of Stockholders' Equity (USD $) In Millions	Total	Class A Common Stock	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Balance at Dec. 31, 2009		$ 39.3	$ 39.9	$ 636.9	$ 365.4	$ (230.9)	$ (79.9)	$ 19.1
Foreign currency translation adjustments	7.3					7.3
Net earnings	111.7				111.7
Net earnings of Tianlong								(0.2)
Buy out of Tianlong				12.9				(18.9)
Unrealized net gain (loss) on cash flow derivative instruments, less related income tax (provision) benefit of $(0.6) in 2012, $7.0 in 2011 and $0.1 in 2010	(0.2)					(0.2)
Cash dividends on stock					(25.0)
Conversion of Class A Common Stock		(1.9)	0.3	1.6
Change in pension liability less related income tax benefit of $13.6 in 2012, $34.8 in 2011 and $2.7 in 2010	(5.6)					(5.6)
Issuance of share units				(3.1)
Vesting of share units				(1.6)
Stock based compensation expense				6.1
Exercise of stock options				(1.2)			4.6
Tax benefit from exercise of stock options and vesting of share units				0.7
Stock incentives and directors' compensation				3.4			0.3
Vesting of share units, net of 27,561 shares surrendered to pay taxes in 2010							0.4
Balance at Dec. 31, 2010	881.4	37.4	40.2	655.7	452.1	(229.4)	(74.6)
Foreign currency translation adjustments	(7.2)					(7.2)
Net earnings	305.7				305.7
Unrealized net gain (loss) on cash flow derivative instruments, less related income tax (provision) benefit of $(0.6) in 2012, $7.0 in 2011 and $0.1 in 2010	(11.0)					(11.0)
Cash dividends on stock					(27.9)
Conversion of Class A Common Stock		(1.1)	0.2	0.9
Change in pension liability less related income tax benefit of $13.6 in 2012, $34.8 in 2011 and $2.7 in 2010	(54.5)					(54.5)
Issuance of share units				(3.7)
Unrealized (loss) gain on investments less income tax benefit (provision) of $0.7 in 2012 and $(0.7) in 2011	1.2					1.2
Vesting of share units				(8.2)
Stock based compensation expense				6.7
Exercise of stock options				(7.5)			15.3
Tax benefit from exercise of stock options and vesting of share units				4.3
Stock incentives and directors' compensation				4.3			0.4
Shares repurchased	(23.5)						(23.5)
Vesting of share units, net of 27,561 shares surrendered to pay taxes in 2010							10.0
Balance at Dec. 31, 2011	1,085.8	36.3	40.4	652.5	729.9	(300.9)	(72.4)
Foreign currency translation adjustments	3.0					3.0
Net earnings	158.7				158.7
Unrealized net gain (loss) on cash flow derivative instruments, less related income tax (provision) benefit of $(0.6) in 2012, $7.0 in 2011 and $0.1 in 2010	1.0					1.0
Cash dividends on stock					(33.5)
Conversion of Class A Common Stock		(3.0)	0.6	2.4
Change in pension liability less related income tax benefit of $13.6 in 2012, $34.8 in 2011 and $2.7 in 2010	(22.4)					(22.4)
Issuance of share units				(3.9)
Unrealized (loss) gain on investments less income tax benefit (provision) of $0.7 in 2012 and $(0.7) in 2011	(1.2)					(1.2)
Vesting of share units				(4.9)
Stock based compensation expense				6.8
Exercise of stock options				(11.4)			19.7
Tax benefit from exercise of stock options and vesting of share units				8.8
Stock incentives and directors' compensation				4.5			0.2
Shares repurchased	(22.0)						(22.0)
Vesting of share units, net of 27,561 shares surrendered to pay taxes in 2010							4.9
Balance at Dec. 31, 2012	$ 1,194.1	$ 33.3	$ 41.0	$ 654.8	$ 855.1	$ (320.5)	$ (69.6)