Supplemental Guarantor Information Supplemental (Details) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended																			3 Months Ended
	Mar. 31, 2012 USD ($)	Mar. 26, 2011 USD ($)	Apr. 03, 2012 USD ($)	Jun. 30, 2007 USD ($)	Apr. 03, 2012 Term Loan Agreement [Member] USD ($)	Apr. 03, 2012 Revolving Credit [Member] USD ($)	Mar. 31, 2012 Scenario, Previously Reported [Member] USD ($)	Mar. 31, 2012 Scenario, Adjustment [Member] USD ($)	Mar. 31, 2012 Issuer 2002 [Member] USD ($)	Mar. 26, 2011 Issuer 2002 [Member] USD ($)	Mar. 31, 2012 Parent Company [Member] USD ($)	Mar. 26, 2011 Parent Company [Member] USD ($)	Sep. 22, 2005 Issuer 2005 And Issuer 2010 [Member] Senior Notes [Member] USD ($)	Mar. 31, 2012 $850 million 6.375% Senior Notes due 2012 Senior Notes [Member] USD ($)	Dec. 31, 2011 $850 million 6.375% Senior Notes due 2012 Senior Notes [Member] USD ($)	May 07, 2002 $850 million 6.375% Senior Notes due 2012 Issuer 2002 [Member] Senior Notes [Member] USD ($)	Mar. 31, 2012 $575 million 2.5% convertible Senior Notes due 2013 Senior Notes [Member] USD ($)		Dec. 31, 2011 $575 million 2.5% convertible Senior Notes due 2013 Senior Notes [Member] USD ($)		Jun. 25, 2011 $575 million 2.5% convertible Senior Notes due 2013 Senior Notes [Member] USD ($)	Jun. 15, 2007 $575 million 2.5% convertible Senior Notes due 2013 Parent Company [Member] Senior Notes [Member] USD ($)	May 03, 2012 Senior Notes Due 2017 $300M 2.0% [Member] Parent Company [Member] Senior Notes [Member] USD ($)	May 03, 2012 Senior Notes Due 2022 $500M 3.5% [Member] Parent Company [Member] Senior Notes [Member] USD ($)	May 03, 2012 Senior Notes Due 2042 $1.1B 5.0% [Member] Parent Company [Member] Senior Notes [Member] USD ($)	Mar. 26, 2011 Senior Notes 4.85 Percent and 5 Percent due 2010 and 2015 [Member] Issuer 2005 And Issuer 2010 [Member] Senior Notes [Member] USD ($)	Sep. 22, 2005 Senior Notes 4.85 Percent and 5 Percent due 2010 and 2015 [Member] Issuer 2005 And Issuer 2010 [Member] Senior Notes [Member] USD ($)	Mar. 31, 2012 CAD 500 million 3.95% Series A notes due 2017 Senior Notes [Member] USD ($)	Dec. 31, 2011 CAD 500 million 3.95% Series A notes due 2017 Senior Notes [Member] USD ($)	Oct. 06, 2010 CAD 500 million 3.95% Series A notes due 2017 Senior Notes [Member] CAD	Sep. 22, 2005 CAD 500 million 3.95% Series A notes due 2017 Issuer 2005 And Issuer 2010 [Member] Senior Notes [Member] CAD	Jun. 25, 2011 Revolving Multicurrency Bank Credit Facility [Member] Line of Credit [Member] USD ($)
Debt Instrument [Line Items]
Debt face amount				$ 575	$ 300	$ 300							$ 1,100	$ 850		$ 850					$ 575	$ 575	$ 300	$ 500	$ 1,100		$ 300	$ 500		500	900
Debt Instrument, Interest Rate, Stated Percentage														6.375%		6.375%	2.50%					2.50%	2.00%	3.50%	5.00%		4.85%	3.95%		3.95%	5.00%
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities																										300
Total long-term debt (including current portion) before unamortized discounts and other														44.6	44.6		575.0	[1],[2]	575.0	[1],[2]								500.7	489.6
Line of Credit Facility, Maximum Borrowing Capacity			550																													400
Other income (expense), net	$ (1.4)	$ (0.7)					$ 102.8	$ (1.2)	$ (12.2)	$ (1.2)	$ 12.0	$ 1.4

[1] The original conversion price for each $1,000 aggregate principal amount of notes was $54.76 per share of our Class B common stock, which represented a 25% premium above the stock price on the day of issuance of the notes and corresponded to the initial conversion ratio of 18.263 shares per each $1,000 aggregate principal amount of notes. The conversion ratio and conversion price are subject to adjustments for certain events and provisions, as defined in the indenture. As of March 2012, our conversion price and ratio are $52.79 and 18.9441 shares, respectively. Currently, the convertible debt's if-converted value does not exceed the principal.

[2] During the first quarters of 2012 and 2011, we incurred additional non-cash interest expense of $4.5 million and $4.3 million, respectively. We also incurred interest expense related to the 2.5% convertible coupon rate of $3.7 million during the first quarter of 2012, and $3.6 million during the first quarter of 2011. The combination of non-cash and cash interest resulted in an effective interest rate of 5.91% and 5.97% for the first quarters of 2012 and 2011, respectively. In relation to this issuance, paid in capital in the equity section of our balance sheet includes $103.9 million, ($64.2 million net of tax), representing the equity component of the convertible debt. Further, as of March 31, 2012, and December 31, 2011, $24.4 million and $28.9 million, respectively, of the unamortized debt discount and other balance relates to our $575 million convertible debt. We expect to record additional non-cash interest expense of approximately $14 million in 2012 and $11 million in 2013, thereby increasing the carrying value of the convertible debt to its $575 million face value at maturity in July 2013. The remaining $2.1 million and $1.9 million as of March 31, 2012, and December 31, 2011, respectively, relates to unamortized debt premiums, discounts, and other on the additional debt balances.