Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended												12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Foreign Tax Credits Deducted on 2006 Tax Return [Member]	Dec. 31, 2013 Foreign Tax Credits Deducted on 2007 Tax Return [Member]	Dec. 31, 2013 Federal [Member]	Dec. 31, 2012 Federal [Member]	Dec. 31, 2013 State [Member]	Dec. 31, 2012 State [Member]	Dec. 31, 2013 Foreign [Member]	Dec. 31, 2012 Foreign [Member]	Dec. 31, 2013 Equity Component [Domain]	Dec. 31, 2014 Scenario, Forecast [Member]
Income Tax And Carryforwards [Line Items]
Tax provision allocated to accumulated other comprehensive income/(loss)	$ 15.9	$ 10.9	$ 70.9
Tax impact of the reclassification of losses on derivative instruments from accumulated other comprehensive loss to interest expense			117.3
Tax impact related to the change in fair market value of derivatives			28.4
Tax impact of foreign currency translation adjustments			19.2
Equity impact of tax deductions related to equity compensation	141.5	120.6										2.4
Operating loss carryforward						3,654.7	2,418.2	6,500.7	5,976.8	118.9	162.4
Federal general business tax credits carryforward	27.5
Deferred Tax Assets, Capital Loss Carryforwards	370.5
Operating Loss Carryforwards, Valuation Allowance	336.5
Operating loss carryforward, amount to expire	22.7
Foreign tax credit carryforwards	7.2	12.3
Foreign tax credits deducted on amended tax return				12.4	12.6
Foreign Tax Credit Carryforward Subject to Expiration	7.2
Deferred Tax Assets, Investments in Foreign Subsidiaries	110.3
Deferred tax assets, valuation allowance for Investments in foreign subsidiaries	13.3
Tax benefit due to IRS settlements	51.4
Interest and penalties accrued for unrecognized tax benefits, current period	(10.0)	(8.0)	19.0
Interest and penalties accrued for unrecognized tax benefits, total	63	73	80
Unrecognized tax benefits that would impact the effective tax rate	91	219	287
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	$ 66.5	$ 0.1	$ 4.9										$ 66.4