Debt (Components of Debt) (Detail) (USD $) In Millions, unless otherwise specified					9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended				9 Months Ended			9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2012 5.625% Senior Notes Due January 15, 2012 [Member]	Dec. 31, 2011 5.625% Senior Notes Due January 15, 2012 [Member]	Sep. 30, 2012 4.95% Senior Notes Due April 1, 2014 [Member]	Dec. 31, 2011 4.95% Senior Notes Due April 1, 2014 [Member]	Sep. 30, 2012 5.50% Senior Notes Due May 15, 2015 [Member]	Dec. 31, 2011 5.50% Senior Notes Due May 15, 2015 [Member]	Sep. 30, 2012 8.60% Senior Notes Due August 15, 2016 [Member]	Dec. 31, 2011 8.60% Senior Notes Due August 15, 2016 [Member]	Sep. 30, 2012 6.125% Senior Notes Due January 15, 2017 [Member]	Dec. 31, 2011 6.125% Senior Notes Due January 15, 2017 [Member]	Sep. 30, 2012 7.25% Senior Notes Due May 15, 2018 [Member]	Dec. 31, 2011 7.25% Senior Notes Due May 15, 2018 [Member]	Sep. 30, 2012 11.25% Senior Notes Due February 1, 2019 [Member]		Dec. 31, 2011 11.25% Senior Notes Due February 1, 2019 [Member]		Sep. 30, 2012 8.25% Senior Notes Due March 15, 2019 [Member]	Sep. 30, 2012 7.625% Senior Notes Due June 15, 2020 [Member]	Dec. 31, 2011 7.625% Senior Notes Due June 15, 2020 [Member]	Sep. 30, 2012 8.875% Debentures Due April 15, 2021 [Member]	Dec. 31, 2011 8.875% Debentures Due April 15, 2021 [Member]	Sep. 30, 2012 6.625% Debentures Due April 15, 2029 [Member]	Dec. 31, 2011 6.625% Debentures Due April 15, 2029 [Member]	Sep. 30, 2012 8.820% Debentures Due April 15, 2031 [Member]	Dec. 31, 2011 8.820% Debentures Due April 15, 2031 [Member]	Sep. 20, 2012 Revised Interest Rate Stated Percentage [Member]	Aug. 02, 2012 Revised Interest Rate Stated Percentage [Member]	Jun. 14, 2012 Revised Interest Rate Stated Percentage [Member]	May 17, 2011 Revised Interest Rate Stated Percentage [Member]	Sep. 30, 2012 Credit Agreement [Member]	Dec. 31, 2011 Credit Agreement [Member]
Debt Disclosure [Line Items]
Borrowings under the Previous Credit Agreement																																		$ 344.0	$ 65.0
Senior notes						158.6	258.1	599.5	299.8	399.8	347.3	346.8	523.2	522.9	600.0	600.0					450.0	400.0	400.0
Interest rate					5.625%		4.95%		5.50%		8.60%		6.125%		7.25%		11.25%	[1]			8.25%	7.625%		8.875%		6.625%		8.82%		12.50%	12.25%	12.00%	11.75%
Maturity date					Jan. 15, 2012		Apr. 01, 2014		May 15, 2015		Aug. 15, 2016		Jan. 15, 2017		May 15, 2018		Feb. 01, 2019				Mar. 15, 2019	Jun. 15, 2020		Apr. 15, 2021		Apr. 15, 2029		Apr. 15, 2031
Debentures																	172.2	[1]	172.2	[1]				80.9	80.9	199.4	199.3	69.0	69.0
Other	42.5	[2]	46.5	[2]
Total debt	3,786.4		3,660.5
Less: current portion	(364.1)		(243.7)
Long-term debt	$ 3,422.3		$ 3,416.8

[1] On May 17, 2011, June 14, 2012, August 2, 2012 and September 20, 2012, the interest rate on the 11.25% senior notes due February 1, 2019 was increased to 11.75%, 12.0%, 12.25% and 12.50%, respectively, as a result of downgrades in the ratings of the notes by the rating agencies.

[2] Includes miscellaneous debt obligations, fair value adjustments to the Company's 4.95% senior notes due April 1, 2014 and 8.25% senior notes due March 15, 2019 related to the Company's fair value hedges and capital leases.