Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Expected Amortization Expense
Estimated amortization expense 2014	$ 115.9
Estimated amortization expense 2015	115.5
Estimated amortization expense 2016	114.4
Estimated amortization expense 2017	112.9
Estimated amortization expense 2018	$ 110.2