v3.26.1
Shareholder Report, Holdings (Details)
Mar. 31, 2026
C000174035 | Liberty Mutual Group, Inc., 7.800%, 03/15/27  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000174035 | Banco Santander S.A., 4.75, 2027-05-12  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000174035 | Provident Financing Trust I, 7.405%, 03/15/38  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000174035 | M&T Bank Corporation, 5.625%, 12/15/26  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000174035 | Flagstar Financial Inc., 6.375%, 03/17/27  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000174035 | Athene Holding Ltd., 6.350%, 06/30/29  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000174035 | Pinnacle Financial Partners, Inc., 8.397%  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000174035 | Delphi Financial Group, Inc., 7.107%, 05/15/37  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000174035 | HSBC Holdings PLC, 8, 2028-09-07  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000174035 | Land O' Lakes, Inc., 8.000%  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000174035 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000174035 | Money Market Funds  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000174035 | Contingent Capital Securities  
Holdings [Line Items]  
Percent of Net Asset Value 24.00%
C000174035 | Preferred Securities  
Holdings [Line Items]  
Percent of Net Asset Value 73.00%
C000174035 | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000174035 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000174035 | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000174035 | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000174035 | Communications  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000174035 | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000174035 | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000174035 | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 75.20%
C000174036 | Liberty Mutual Group, Inc., 7.800%, 03/15/27  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000174036 | Banco Santander S.A., 4.75, 2027-05-12  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000174036 | Provident Financing Trust I, 7.405%, 03/15/38  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000174036 | M&T Bank Corporation, 5.625%, 12/15/26  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000174036 | Flagstar Financial Inc., 6.375%, 03/17/27  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000174036 | Athene Holding Ltd., 6.350%, 06/30/29  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000174036 | Pinnacle Financial Partners, Inc., 8.397%  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000174036 | Delphi Financial Group, Inc., 7.107%, 05/15/37  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000174036 | HSBC Holdings PLC, 8, 2028-09-07  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000174036 | Land O' Lakes, Inc., 8.000%  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000174036 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000174036 | Money Market Funds  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000174036 | Contingent Capital Securities  
Holdings [Line Items]  
Percent of Net Asset Value 24.00%
C000174036 | Preferred Securities  
Holdings [Line Items]  
Percent of Net Asset Value 73.00%
C000174036 | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000174036 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000174036 | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000174036 | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000174036 | Communications  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000174036 | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000174036 | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000174036 | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 75.20%
C000174037 | Liberty Mutual Group, Inc., 7.800%, 03/15/27  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000174037 | Banco Santander S.A., 4.75, 2027-05-12  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000174037 | Provident Financing Trust I, 7.405%, 03/15/38  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000174037 | M&T Bank Corporation, 5.625%, 12/15/26  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000174037 | Flagstar Financial Inc., 6.375%, 03/17/27  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000174037 | Athene Holding Ltd., 6.350%, 06/30/29  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000174037 | Pinnacle Financial Partners, Inc., 8.397%  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000174037 | Delphi Financial Group, Inc., 7.107%, 05/15/37  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000174037 | HSBC Holdings PLC, 8, 2028-09-07  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000174037 | Land O' Lakes, Inc., 8.000%  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000174037 | Corporate Debt Securities  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000174037 | Money Market Funds  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000174037 | Contingent Capital Securities  
Holdings [Line Items]  
Percent of Net Asset Value 24.00%
C000174037 | Preferred Securities  
Holdings [Line Items]  
Percent of Net Asset Value 73.00%
C000174037 | Materials  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000174037 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000174037 | Consumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000174037 | Consumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000174037 | Communications  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000174037 | Energy  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000174037 | Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000174037 | Financials  
Holdings [Line Items]  
Percent of Net Asset Value 75.20%