Debt (Narrative) (Details) (USD $)	12 Months Ended			1 Months Ended		12 Months Ended			1 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Sep. 28, 2011 11.25% Senior Notes Due February 1, 2019 [Member]	Jun. 30, 2011 11.25% Senior Notes Due February 1, 2019 [Member]	Dec. 31, 2011 11.25% Senior Notes Due February 1, 2019 [Member]	Dec. 31, 2011 7.25% Senior Notes Due May 15, 2018 [Member]	Jun. 01, 2011 7.25% Senior Notes Due May 15, 2018 [Member]	Jun. 30, 2011 6.125% Senior Notes Due January 15, 2017 [Member]	Dec. 31, 2011 6.125% Senior Notes Due January 15, 2017 [Member]	Jun. 15, 2011 5.50% Senior Notes Due May 15, 2015 [Member]	Dec. 31, 2011 5.50% Senior Notes Due May 15, 2015 [Member]	Dec. 31, 2011 7.625% Senior Notes Due June 15, 2020 [Member]	Dec. 31, 2011 Credit Agreement [Member]	Dec. 31, 2010 Credit Agreement [Member]	Dec. 31, 2010 Previous Facility [Member]	Dec. 31, 2011 Foreign Facilities [Member]
Debt Instrument [Line Items]
Amount of difference between fair value and book value	$ 80,100,000	$ 259,300,000
Repurchase of debt				11,600,000	216,200,000				100,000,000		100,000,000
Debt instrument, face amount								600,000,000					400,000,000
Interest rate						11.25%	7.25%			6.125%		5.50%	7.625%
Maturity date						Feb. 01, 2019	May 15, 2018			Jan. 15, 2017		May 15, 2015	Jun. 15, 2020
Pre-tax loss on debt extinguishment	(69,900,000)
Credit facility, maximum borrowing capacity														1,750,000,000		2,000,000,000	151,800,000
Revolving credit agreement expiration date	December 17, 2013
Credit facility, amount outstanding	82,200,000	129,100,000												65,000,000	120,000,000
Weighted average interest rate on borrowings, per annum														2.08%	1.27%
Outstanding letters of credit	60,900,000
Credit facility, remaining borrowing capacity	1,800,000,000
Credit facility, remaining current borrowing capacity	1,400,000,000
Interest paid	$ 252,200,000	$ 235,200,000	$ 226,500,000