Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrecognized losses for all terminated cash flow hedges included in accumulated other comprehensive income	$ 81.1	$ 35.9
Contractual notional amount	23,224.1	13,778.4
Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total amount of amortization over the next twelve months for all cash flow hedges	5.8
Unrecognized losses for all terminated cash flow hedges included in accumulated other comprehensive income	81.1	$ 35.9
Contractual notional amount	$ 4,650.0