Loans and Leases (Credit Quality Indicator At Amortized Cost By Origination Year) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	$ 8,703.3	$ 7,448.6
2020/2019	4,382.7	3,667.9
2019/2018	2,626.7	1,352.6
2018/2017	931.6	1,123.1
2017/2016	675.7	1,254.8
PRIOR	2,490.3	3,128.5
REVOLVING LOANS	20,378.9	15,453.6
REVOLVING LOANS CONVERTED TO TERM LOANS	291.4	330.6
TOTAL LOANS AND LEASES	40,480.6	33,759.7
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	4,326.3	3,558.4
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	5,287.1	3,772.7
2020/2019	1,939.4	2,187.7
2019/2018	1,550.6	990.3
2018/2017	703.5	725.0
2017/2016	419.5	749.9
PRIOR	1,381.8	1,285.8
REVOLVING LOANS	7,147.1	5,490.9
REVOLVING LOANS CONVERTED TO TERM LOANS	58.4	59.7
TOTAL LOANS AND LEASES	18,487.4	15,262.0
Commercial | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	2,151.5	1,491.5
2020/2019	922.2	1,170.9
2019/2018	717.8	596.0
2018/2017	418.4	544.2
2017/2016	292.2	553.6
PRIOR	727.8	622.1
REVOLVING LOANS	6,226.1	5,042.2
REVOLVING LOANS CONVERTED TO TERM LOANS	33.2	37.8
TOTAL LOANS AND LEASES	11,489.2	10,058.3
Commercial | Commercial and Institutional | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	1,057.9	663.8
2020/2019	469.7	546.0
2019/2018	313.7	204.6
2018/2017	156.6	96.0
2017/2016	48.2	396.0
PRIOR	535.8	448.8
REVOLVING LOANS	4,944.9	3,742.4
REVOLVING LOANS CONVERTED TO TERM LOANS	0.1	5.5
TOTAL LOANS AND LEASES	7,526.9	6,103.1
Commercial | Commercial and Institutional | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	1,043.6	793.4
2020/2019	432.2	505.1
2019/2018	377.3	354.1
2018/2017	231.6	405.4
2017/2016	234.1	134.6
PRIOR	190.1	167.3
REVOLVING LOANS	1,219.0	1,238.7
REVOLVING LOANS CONVERTED TO TERM LOANS	33.1	32.3
TOTAL LOANS AND LEASES	3,761.0	3,630.9
Commercial | Commercial and Institutional | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	50.0	34.3
2020/2019	20.3	119.8
2019/2018	26.8	37.3
2018/2017	30.2	42.8
2017/2016	9.9	23.0
PRIOR	1.9	6.0
REVOLVING LOANS	62.2	61.1
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	201.3	324.3
Commercial | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	1,477.7	1,124.7
2020/2019	948.3	976.2
2019/2018	771.3	392.3
2018/2017	283.2	169.7
2017/2016	118.2	196.3
PRIOR	451.9	494.4
REVOLVING LOANS	252.3	184.7
REVOLVING LOANS CONVERTED TO TERM LOANS	23.4	20.1
TOTAL LOANS AND LEASES	4,326.3	3,558.4
Commercial | Commercial Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	485.3	406.3
2020/2019	310.2	109.2
2019/2018	260.6	27.6
2018/2017	60.2	36.5
2017/2016	16.8	11.8
PRIOR	79.3	99.4
REVOLVING LOANS	67.5	124.3
REVOLVING LOANS CONVERTED TO TERM LOANS	2.9	8.7
TOTAL LOANS AND LEASES	1,282.8	823.8
Commercial | Commercial Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	967.9	703.1
2020/2019	638.1	811.8
2019/2018	460.1	332.7
2018/2017	223.0	107.4
2017/2016	81.4	184.5
PRIOR	364.1	382.8
REVOLVING LOANS	182.3	60.4
REVOLVING LOANS CONVERTED TO TERM LOANS	20.5	11.4
TOTAL LOANS AND LEASES	2,937.4	2,594.1
Commercial | Commercial Real Estate | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	24.5	15.3
2020/2019	0.0	55.2
2019/2018	50.6	32.0
2018/2017	0.0	25.8
2017/2016	20.0	0.0
PRIOR	8.5	12.2
REVOLVING LOANS	2.5	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	106.1	140.5
Commercial | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	987.2	868.3
2020/2019	68.9	40.6
2019/2018	61.5	2.0
2018/2017	1.9	11.1
2017/2016	9.1	0.0
PRIOR	191.1	157.9
REVOLVING LOANS	668.7	264.0
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8	1.8
TOTAL LOANS AND LEASES	1,990.2	1,345.7
Commercial | Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	824.1	555.2
2020/2019	68.9	16.8
2019/2018	38.4	0.0
2018/2017	0.0	11.1
2017/2016	9.1	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	582.0	78.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	1,522.5	661.6
Commercial | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	160.2	313.1
2020/2019	0.0	0.7
2019/2018	0.0	2.0
2018/2017	1.9	0.0
2017/2016	0.0	0.0
PRIOR	191.1	157.9
REVOLVING LOANS	73.3	39.2
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8	1.8
TOTAL LOANS AND LEASES	428.3	514.7
Commercial | Non-U.S. | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	2.9	0.0
2020/2019	0.0	23.1
2019/2018	23.1	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	13.4	146.3
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	39.4	169.4
Commercial | Lease Financing, net
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	11.0	11.4
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	11.0	11.4
Commercial | Lease Financing, net | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	11.0	11.4
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	11.0	11.4
Commercial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	670.7	288.2
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	670.7	288.2
Commercial | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	551.5	81.7
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	551.5	81.7
Commercial | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	119.2	206.5
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	119.2	206.5
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	3,416.2	3,675.9
2020/2019	2,443.3	1,480.2
2019/2018	1,076.1	362.3
2018/2017	228.1	398.1
2017/2016	256.2	504.9
PRIOR	1,108.5	1,842.7
REVOLVING LOANS	13,231.8	9,962.7
REVOLVING LOANS CONVERTED TO TERM LOANS	233.0	270.9
TOTAL LOANS AND LEASES	21,993.2	18,497.7
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	1,041.8	1,166.7
2020/2019	432.0	754.1
2019/2018	606.3	191.1
2018/2017	116.3	124.0
2017/2016	93.1	87.7
PRIOR	169.7	213.6
REVOLVING LOANS	12,574.1	9,021.2
REVOLVING LOANS CONVERTED TO TERM LOANS	223.0	256.7
TOTAL LOANS AND LEASES	15,256.3	11,815.1
Personal | Private Client | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	455.5	668.6
2020/2019	97.9	273.7
2019/2018	87.0	51.7
2018/2017	14.9	60.4
2017/2016	38.3	10.2
PRIOR	129.8	136.1
REVOLVING LOANS	7,592.8	5,392.8
REVOLVING LOANS CONVERTED TO TERM LOANS	44.7	47.9
TOTAL LOANS AND LEASES	8,460.9	6,641.4
Personal | Private Client | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	579.2	492.1
2020/2019	333.9	479.9
2019/2018	519.3	117.3
2018/2017	81.0	60.4
2017/2016	54.8	77.5
PRIOR	39.9	77.5
REVOLVING LOANS	4,979.8	3,564.7
REVOLVING LOANS CONVERTED TO TERM LOANS	178.3	207.3
TOTAL LOANS AND LEASES	6,766.2	5,076.7
Personal | Private Client | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	7.1	6.0
2020/2019	0.2	0.5
2019/2018	0.0	22.1
2018/2017	20.4	3.2
2017/2016	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	1.5	63.7
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	1.5
TOTAL LOANS AND LEASES	29.2	97.0
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	2,275.5	2,424.2
2020/2019	2,009.4	685.2
2019/2018	449.9	159.4
2018/2017	101.4	273.6
2017/2016	163.1	416.7
PRIOR	933.8	1,619.1
REVOLVING LOANS	384.6	448.4
REVOLVING LOANS CONVERTED TO TERM LOANS	2.2	9.1
TOTAL LOANS AND LEASES	6,319.9	6,035.7
Personal | Residential Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	1,137.8	1,554.3
2020/2019	996.4	317.4
2019/2018	201.8	42.9
2018/2017	13.5	109.9
2017/2016	49.3	205.1
PRIOR	505.8	627.8
REVOLVING LOANS	161.5	152.8
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	1.7
TOTAL LOANS AND LEASES	3,066.1	3,011.9
Personal | Residential Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	1,137.3	854.6
2020/2019	1,002.5	359.5
2019/2018	242.7	115.8
2018/2017	79.5	163.2
2017/2016	113.3	209.7
PRIOR	369.8	896.5
REVOLVING LOANS	218.1	273.1
REVOLVING LOANS CONVERTED TO TERM LOANS	2.2	7.4
TOTAL LOANS AND LEASES	3,165.4	2,879.8
Personal | Residential Real Estate | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	0.4	15.3
2020/2019	10.5	8.3
2019/2018	5.4	0.7
2018/2017	8.4	0.5
2017/2016	0.5	1.9
PRIOR	58.2	94.8
REVOLVING LOANS	5.0	22.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	88.4	144.0
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	63.7	36.0
2020/2019	1.9	40.9
2019/2018	19.9	11.8
2018/2017	10.4	0.5
2017/2016	0.0	0.5
PRIOR	5.0	10.0
REVOLVING LOANS	273.1	493.1
REVOLVING LOANS CONVERTED TO TERM LOANS	7.8	5.1
TOTAL LOANS AND LEASES	381.8	597.9
Personal | Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	27.6	23.3
2020/2019	0.0	14.9
2019/2018	1.2	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	1.0	1.8
REVOLVING LOANS	44.1	275.6
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	73.9	315.6
Personal | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	36.1	12.7
2020/2019	1.9	26.0
2019/2018	18.7	11.8
2018/2017	10.4	0.5
2017/2016	0.0	0.5
PRIOR	3.8	7.9
REVOLVING LOANS	229.0	217.5
REVOLVING LOANS CONVERTED TO TERM LOANS	7.8	5.1
TOTAL LOANS AND LEASES	307.7	282.0
Personal | Non-U.S. | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	0.2	0.3
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	0.2	0.3
Personal | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	35.2	49.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	35.2	49.0
Personal | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	13.4	34.6
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	13.4	34.6
Personal | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2021/2020	21.8	14.4
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
2017/2016	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	$ 21.8	$ 14.4