Debt (Components of Long Term Debt) (Detail) In Millions, unless otherwise specified	Sep. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 4% Notes, Due 2013 USD ($)	Dec. 31, 2012 4% Notes, Due 2013 EUR (€)	Sep. 30, 2013 4.875% Notes, Due 2013 USD ($)	Dec. 31, 2012 4.875% Notes, Due 2013 USD ($)	Dec. 31, 2012 6.375% Notes, Due 2014 USD ($)	Sep. 30, 2013 5.375% Notes, Due 2016 USD ($)	Dec. 31, 2012 5.375% Notes, Due 2016 USD ($)	Sep. 30, 2013 1.875% notes, Due 2017 USD ($)	Dec. 31, 2012 1.875% notes, Due 2017 USD ($)	Sep. 30, 2013 1.75% Notes, Due 2018 USD ($)	Sep. 30, 2013 8.625% Debentures, Due 2021 USD ($)	Dec. 31, 2012 8.625% Debentures, Due 2021 USD ($)	Sep. 30, 2013 3.25% Notes. Due 2022 USD ($)	Dec. 31, 2012 3.25% Notes. Due 2022 USD ($)	Sep. 30, 2013 3.25% Notes, Due 2023 USD ($)	Sep. 30, 2013 7.875% Debentures, Due 2023 USD ($)	Dec. 31, 2012 7.875% Debentures, Due 2023 USD ($)	Sep. 30, 2013 6.625% Debentures, Due 2028 USD ($)	Dec. 31, 2012 6.625% Debentures, Due 2028 USD ($)	Sep. 30, 2013 5.875% Notes, Due 2036 USD ($)	Dec. 31, 2012 5.875% Notes, Due 2036 USD ($)	Sep. 30, 2013 Miscellaneous USD ($)	Dec. 31, 2012 Miscellaneous USD ($)
Debt Instrument [Line Items]
Total debt	$ 2,215.1	$ 2,494.2	$ 288.8	€ 218.8	$ 180.5	$ 180.5	$ 326.4	$ 400.0	$ 400.0	$ 300.0	$ 300.0	$ 250.0	$ 56.6	$ 59.3	$ 300.0	$ 300.0	$ 250.0	$ 112.0	$ 113.8	$ 184.3	$ 200.0	$ 161.8	$ 300.0	$ 19.9	$ 25.4
Less current portion	180.5	469.3
Total long-term debt	$ 2,034.6	$ 2,024.9