Goodwill and Other Intangible Assets - Changes in Intangible Assets Other Than Goodwill (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Intangible Assets Other Than Goodwill [Abstract]
Amortizing Intangible Assets, Beginning Balance			$ 1,163.7	$ 1,235.1
Amortizing Intangible Assets, Impairments			0	0
Amortizing Intangible Assets, Additions				85.4
Amortizing Intangible Assets, Amortization expense			(174.6)	(156.7)	(160.8)
Amortizing Intangible Assets, Foreign currency translation			0.7	(0.1)
Amortizing Intangible Assets, Ending Balance	1,027.6		1,027.6	1,163.7	1,235.1
Other Non-Amortizing Intangible Assets, Beginning Balance			3,199.5	3,184.0
Other Non-Amortizing Intangible Assets, Impairment	(50.0)	(159.0)	(242.0)	(8.0)
Other Non-Amortizing Intangible Assets, Additions			0	23.5
Other Non-Amortizing Intangible Assets, Foreign currency translation			0.6	0
Other Non-Amortizing Intangible Assets, Ending Balance	2,958.1		2,958.1	3,199.5	3,184.0
Buffalo Studios, LLC [Member]
Intangible Assets Other Than Goodwill [Abstract]
Amortizing Intangible Assets, Additions			$ 37.8