Summary of Intangibles and Other Assets (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Intangibles And Other Assets Net [Line Items]
Intangibles not subject to amortization - Cost	$ 469,100,000
Intangibles subject to amortization - Accumulated Amortization	207,400,000
Intangibles Not subject to amortization - Net	261,700,000
Finite And Indefinite Lived Intangible Assets Cost	514.5
Finite And Indefinite Lived Intangible Assets Accumulated Amortization	207.4
Finite And Indefinite Lived Intangible Assets Net, Total	307.1
Other Assets - Cost	31,800,000
Other Assets - Accumulated Amortization	9,800,000
Other Assets - Net	22,000,000
Intangibles And Other Assets - Cost	546,300,000
Intangibles And Other Assets - Accumulated Amortization	217,200,000
Intangibles And Other Assets - Net	329,100,000	341,100,000
Financing Costs
Intangibles And Other Assets Net [Line Items]
Other Assets - Cost	23,200,000
Other Assets - Accumulated Amortization	9,500,000
Other Assets - Net	13,700,000
Deposits
Intangibles And Other Assets Net [Line Items]
Other Assets - Cost	7,200,000
Other Assets - Net	7,200,000
Other
Intangibles And Other Assets Net [Line Items]
Other Assets - Cost	1,400,000
Other Assets - Accumulated Amortization	300,000
Other Assets - Net	1,100,000
Customer Relationships
Intangibles And Other Assets Net [Line Items]
Intangibles not subject to amortization - Cost	366,800,000
Intangibles subject to amortization - Accumulated Amortization	130,100,000
Intangibles Not subject to amortization - Net	236,700,000
Trademarks
Intangibles And Other Assets Net [Line Items]
Intangibles not subject to amortization - Cost	28,700,000
Intangibles subject to amortization - Accumulated Amortization	22,400,000
Intangibles Not subject to amortization - Net	6,300,000
Information Technology
Intangibles And Other Assets Net [Line Items]
Intangibles not subject to amortization - Cost	62,200,000
Intangibles subject to amortization - Accumulated Amortization	47,800,000
Intangibles Not subject to amortization - Net	14,400,000
Other Intangible Assets
Intangibles And Other Assets Net [Line Items]
Intangibles not subject to amortization - Cost	11,400,000
Intangibles subject to amortization - Accumulated Amortization	7,100,000
Intangibles Not subject to amortization - Net	4,300,000
Contractual Rights
Intangibles And Other Assets Net [Line Items]
Intangibles not subject to amortization - Cost	45,400,000
Intangibles Not subject to amortization - Net	$ 45,400,000