Components of Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Borrowings under the Credit Agreement	$ 10.0
Other	9.1	[1]	10.7	[1]
Total debt	3,905.5		3,857.9
Less: current portion	(278.3)		(270.9)
Long-term debt	3,627.2		3,587.0
Senior Notes Four Point Nine Five Percent Due April One Two Thousand Fourteen
Debt Instrument [Line Items]
Senior notes	258.2		258.2
Senior Notes Five Point Five Zero Percent Due May Fifteen Two Thousand Fifteen
Debt Instrument [Line Items]
Senior notes	200.0		200.0
Senior Notes Eight Point Six Zero Percent Due August Fifteen Two Thousand Sixteen
Debt Instrument [Line Items]
Senior notes	218.8		218.7
Senior Notes Six Point One Two Five Percent Due January Fifteen Two Thousand Seventeen
Debt Instrument [Line Items]
Senior notes	250.9		250.8
Senior Notes Seven Point Two Five Percent Due May Fifteen Two Thousand Eighteen
Debt Instrument [Line Items]
Senior notes	250.0		350.0
Debentures Eleven Point Two Five Percent Due February One Two Thousand Nineteen
Debt Instrument [Line Items]
Debentures	172.2	[2]	172.2	[2]
Senior Notes Eight Point Two Five Percent Due March Fifteen Two Thousand Nineteen
Debt Instrument [Line Items]
Senior notes	239.0		450.0
Senior Notes Seven Point Six Two Five Percent Due June Fifteen Two Thousand Twenty
Debt Instrument [Line Items]
Senior notes	350.0		400.0
Senior Notes Seven Point Eight Seven Five Percent Due March Fifteen Two Thousand Twenty One
Debt Instrument [Line Items]
Senior notes	448.0		448.0
Debentures Eight Point Eight Seven Five Percent Due April Fifteen Two Thousand Twenty One
Debt Instrument [Line Items]
Debentures	80.9		80.9
Senior Notes Seven Point Zero Percent Due February Fifteen Two Thousand Twenty Two
Debt Instrument [Line Items]
Senior notes	400.0		400.0
Senior Notes Six Point Five Zero Percent Due November Fifteen Two Thousand Twenty Three
Debt Instrument [Line Items]
Senior notes	350.0		350.0
Senior Notes Six Point Zero Zero Percent Due April One Two Thousand Twenty Four
Debt Instrument [Line Items]
Senior notes	400.0
Debentures Six Point Six Two Five Percent Due April Fifteen Two Thousand Twenty Nine
Debt Instrument [Line Items]
Debentures	199.4		199.4
Debentures Eight Point Eight Two Zero Percent Due April Fifteen Two Thousand Thirty One
Debt Instrument [Line Items]
Debentures	$ 69.0		$ 69.0

[1] Includes miscellaneous debt obligations, fair value adjustments to the 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.

[2] As of March 31, 2014 and December 31, 2013, the interest rate on the 11.25% senior notes due February 1, 2019 was 12.75% as a result of downgrades in the ratings of the notes by the rating agencies.