Long-Term Debt (Schedule Of 7.125% Senior Notes And Senior Floating Rate Notes) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Long-term Debt	$ 1,048,900,000		$ 985,500,000
Call Option, Beginning Date, year one	Apr. 01, 2012	[1]	Apr. 01, 2009	[1]
Call Option, Beginning Date, year two	Apr. 01, 2013	[1]	Apr. 01, 2010	[1]
Call Option, Beginning Date, year three	Apr. 01, 2014	[1]	Apr. 01, 2011	[1]
Call Option, Beginning Date, year four	Apr. 01, 2015	[1]
Call Option, Percentage, year one	103.563%	[1]	102.00%	[1]
Call Option, Percentage, year two	102.375%	[1]	101.00%	[1]
Call Option, Percentage, year three	101.188%	[1]	100.00%	[1]
Call Option, Percentage, year four	100.00%	[1]
7.125% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Face value	200,000,000		200,000,000
Long-term Debt	200,000,000		200,000,000
Fair value	198,500,000		197,500,000
Interest rate	7.125%		7.125%
Maturity date	April 2017		April 2017
Debt instrument, payment terms	Semi-annually: Apr 1 & Oct 1		Semi-annually: Apr 1 & Oct 1
Senior Floating Rate Notes [Member]
Debt Instrument [Line Items]
Fair value	117,500,000		114,400,000
Interest rate	3.00%		2.70%
Maturity date	July 2015		July 2015
Description of variable rate basis	LIBOR		LIBOR
Basis spread on variable rate	2.375%		2.38%
Debt instrument, payment terms	3-month LIBOR rate plus 2.375% Quarterly: Jan 1, Apr 1, Jul 1 & Oct 1		3-month LIBOR rate plus 2.375% Quarterly: Jan 1, Apr 1, Jul 1 & Oct 1
Parent Company [Member]
Debt Instrument [Line Items]
Long-term Debt	823,600,000		802,900,000
Parent Company [Member] | 7.125% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Face value			200,000,000.0
Parent Company [Member] | Senior Floating Rate Notes [Member]
Debt Instrument [Line Items]
Face value	125,000,000.00		125,000,000.0
Parent Company [Member] | North America [Member] | 7.125% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Face value	200,000,000
Interest rate	7.125%
Parent Company [Member] | North America [Member] | Senior Floating Rate Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 125,000,000		$ 125,000,000

[1] The Company may, at its option, redeem the Notes on or after the following dates and percentages (plus interest due)