Segment Information (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	[1]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 50,383,152	$ 44,654,300
US Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	16,554,509	14,159,824
US Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	13,405,878	11,572,251
Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	29,960,387	25,732,075
Canada Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,604,344	3,946,942
Canada Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	27,543	49,186
Canada Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,631,887	3,996,128
EMEA Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,757,593	2,514,868
EMEA Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,162,703	2,178,454
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,920,296	4,693,322
Asia Pacific Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,227,530	2,951,723
Asia Pacific Non-Traditional Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	742,528	667,645
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,970,058	3,619,368
Corporate Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 5,900,524	$ 6,613,407

[1] Total assets for the Corporate and Other segment have been updated to conform with current period presentation for the adoption of the accounting standard update "Simplifying the Presentation of Debt Issuance Costs."