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Shareholders' Interest - Dividends (Narrative) (Detail) $ in Millions		1 Months Ended	3 Months Ended
	Dec. 20, 2015 USD ($)	Jan. 31, 2016 USD ($)	Mar. 31, 2016 USD ($) Markets
Non-strategic outdoor markets [Member]
Dividends [Abstract]
Disposal proceeds		$ 602.0
C C O H [Member] | Non-strategic outdoor markets [Member]
Dividends [Abstract]
Number Of Businesses sold | Markets			9
Disposal proceeds			$ 602.0
C C O H [Member] | Noncontrolling Interest [Member]
Dividends [Abstract]
Dividend received		53.5
iHM [Member]
Dividends [Abstract]
Related party notes outstanding		300.0
iHM [Member] | Parent [Member]
Dividends [Abstract]
Dividend received		486.5
Proceeds from dividends net of notes payable		186.5
Cash Dividend [Member] | C C O H [Member]
Dividends [Abstract]
Dividends declared	$ 217.8	$ 540.0
Dividend payable date	Jan. 07, 2016	Feb. 04, 2016
Dividends payable date of record	Jan. 04, 2016
Cash Dividend [Member] | iHM [Member] | Parent [Member]
Dividends [Abstract]
Dividend received		$ 196.3

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