Loans and Leases (Credit Quality Indicator At Amortized Cost By Origination Year) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	$ 8,378.7	$ 7,724.7
2021/2020	5,700.8	3,571.3
2020/2019	2,958.7	2,863.1
2019/2018	2,173.5	1,226.4
2018/2017	791.4	836.4
PRIOR	3,256.0	3,588.4
REVOLVING LOANS	20,391.6	20,378.9
REVOLVING LOANS CONVERTED TO TERM LOANS	341.2	291.4
TOTAL LOANS AND LEASES	43,991.9	40,480.6
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	6,379.6	5,171.3
2021/2020	3,364.4	1,770.3
2020/2019	1,501.3	1,806.1
2019/2018	1,107.2	660.8
2018/2017	424.1	423.9
PRIOR	1,338.7	1,449.6
REVOLVING LOANS	8,602.7	7,147.0
REVOLVING LOANS CONVERTED TO TERM LOANS	71.3	58.4
TOTAL LOANS AND LEASES	22,789.3	18,487.4
Commercial | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,282.6	2,079.4
2021/2020	2,005.6	757.9
2020/2019	562.3	922.7
2019/2018	393.8	387.7
2018/2017	225.1	308.6
PRIOR	724.2	773.7
REVOLVING LOANS	7,168.9	6,226.0
REVOLVING LOANS CONVERTED TO TERM LOANS	51.0	33.2
TOTAL LOANS AND LEASES	12,413.5	11,489.2
Commercial | Commercial and Institutional | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	642.9	1,042.0
2021/2020	1,154.0	310.2
2020/2019	287.6	468.9
2019/2018	141.3	163.9
2018/2017	52.0	55.4
PRIOR	505.7	541.6
REVOLVING LOANS	6,013.5	4,946.0
REVOLVING LOANS CONVERTED TO TERM LOANS	17.6	0.1
TOTAL LOANS AND LEASES	8,814.6	7,528.1
Commercial | Commercial and Institutional | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	616.2	993.4
2021/2020	820.7	441.7
2020/2019	274.7	406.7
2019/2018	235.2	193.6
2018/2017	152.4	243.3
PRIOR	218.4	230.2
REVOLVING LOANS	1,091.9	1,217.8
REVOLVING LOANS CONVERTED TO TERM LOANS	33.4	33.1
TOTAL LOANS AND LEASES	3,442.9	3,759.8
Commercial | Commercial and Institutional | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	23.5	44.0
2021/2020	30.9	6.0
2020/2019	0.0	47.1
2019/2018	17.3	30.2
2018/2017	20.7	9.9
PRIOR	0.1	1.9
REVOLVING LOANS	63.5	62.2
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	156.0	201.3
Commercial | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	949.0	1,434.8
2021/2020	1,312.3	943.5
2020/2019	818.8	821.9
2019/2018	676.5	271.2
2018/2017	199.0	106.2
PRIOR	322.1	473.0
REVOLVING LOANS	274.6	252.3
REVOLVING LOANS CONVERTED TO TERM LOANS	18.5	23.4
TOTAL LOANS AND LEASES	4,570.8	4,326.3
Commercial | Commercial Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	299.0	472.0
2021/2020	367.8	298.7
2020/2019	218.5	279.8
2019/2018	98.0	65.8
2018/2017	24.9	16.6
PRIOR	46.0	79.5
REVOLVING LOANS	202.0	67.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	2.9
TOTAL LOANS AND LEASES	1,256.2	1,282.8
Commercial | Commercial Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	642.2	912.7
2021/2020	933.3	644.8
2020/2019	600.3	491.5
2019/2018	528.9	205.4
2018/2017	174.1	89.6
PRIOR	276.1	390.6
REVOLVING LOANS	70.1	182.3
REVOLVING LOANS CONVERTED TO TERM LOANS	18.5	20.5
TOTAL LOANS AND LEASES	3,243.5	2,937.4
Commercial | Commercial Real Estate | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	7.8	50.1
2021/2020	11.2	0.0
2020/2019	0.0	50.6
2019/2018	49.6	0.0
2018/2017	0.0	0.0
PRIOR	0.0	2.9
REVOLVING LOANS	2.5	2.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	71.1	106.1
Commercial | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	2,960.3	986.4
2021/2020	46.5	68.9
2020/2019	120.2	61.5
2019/2018	36.9	1.9
2018/2017	0.0	9.1
PRIOR	292.4	191.9
REVOLVING LOANS	1,159.2	668.7
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8	1.8
TOTAL LOANS AND LEASES	4,617.3	1,990.2
Commercial | Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	2,145.0	816.5
2021/2020	46.5	68.9
2020/2019	120.2	38.4
2019/2018	13.8	0.0
2018/2017	0.0	9.1
PRIOR	6.0	0.0
REVOLVING LOANS	1,047.7	582.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	3,379.2	1,514.9
Commercial | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	814.0	167.0
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	1.9
2018/2017	0.0	0.0
PRIOR	286.4	191.9
REVOLVING LOANS	94.7	73.3
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8	1.8
TOTAL LOANS AND LEASES	1,196.9	435.9
Commercial | Non-U.S. | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1.3	2.9
2021/2020	0.0	0.0
2020/2019	0.0	23.1
2019/2018	23.1	0.0
2018/2017	0.0	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	16.8	13.4
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	41.2	39.4
Commercial | Lease Financing, net
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021		0.0
2021/2020		0.0
2020/2019		0.0
2019/2018		0.0
2018/2017		0.0
PRIOR		11.0
REVOLVING LOANS		0.0
REVOLVING LOANS CONVERTED TO TERM LOANS		0.0
TOTAL LOANS AND LEASES	0.0	11.0
Commercial | Lease Financing, net | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021		0.0
2021/2020		0.0
2020/2019		0.0
2019/2018		0.0
2018/2017		0.0
PRIOR		11.0
REVOLVING LOANS		0.0
REVOLVING LOANS CONVERTED TO TERM LOANS		0.0
TOTAL LOANS AND LEASES		11.0
Commercial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,187.7	670.7
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	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	1,187.7	670.7
Commercial | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	912.4	551.5
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	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	912.4	551.5
Commercial | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	275.3	119.2
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	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	275.3	119.2
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,999.1	2,553.4
2021/2020	2,336.4	1,801.0
2020/2019	1,457.4	1,057.0
2019/2018	1,066.3	565.6
2018/2017	367.3	412.5
PRIOR	1,917.3	2,138.8
REVOLVING LOANS	11,788.9	13,231.9
REVOLVING LOANS CONVERTED TO TERM LOANS	269.9	233.0
TOTAL LOANS AND LEASES	21,202.6	21,993.2
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	682.8	1,002.2
2021/2020	942.7	454.2
2020/2019	256.1	490.2
2019/2018	562.6	248.6
2018/2017	77.9	94.3
PRIOR	179.1	169.7
REVOLVING LOANS	10,982.9	12,574.1
REVOLVING LOANS CONVERTED TO TERM LOANS	261.1	223.0
TOTAL LOANS AND LEASES	13,945.2	15,256.3
Personal | Private Client | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	356.6	432.5
2021/2020	251.6	116.6
2020/2019	47.8	90.3
2019/2018	337.7	14.9
2018/2017	13.1	39.3
PRIOR	28.0	129.8
REVOLVING LOANS	5,815.4	7,592.8
REVOLVING LOANS CONVERTED TO TERM LOANS	44.8	44.7
TOTAL LOANS AND LEASES	6,895.0	8,460.9
Personal | Private Client | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	304.4	567.8
2021/2020	691.1	335.2
2020/2019	208.2	396.9
2019/2018	224.9	213.3
2018/2017	45.7	55.0
PRIOR	151.1	39.9
REVOLVING LOANS	5,166.5	4,979.8
REVOLVING LOANS CONVERTED TO TERM LOANS	216.3	178.3
TOTAL LOANS AND LEASES	7,008.2	6,766.2
Personal | Private Client | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	21.8	1.9
2021/2020	0.0	2.4
2020/2019	0.1	3.0
2019/2018	0.0	20.4
2018/2017	19.1	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	1.0	1.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	42.0	29.2
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,094.3	1,452.4
2021/2020	1,349.3	1,346.8
2020/2019	1,201.3	545.0
2019/2018	482.2	306.6
2018/2017	281.6	318.2
PRIOR	1,705.6	1,964.1
REVOLVING LOANS	330.6	384.6
REVOLVING LOANS CONVERTED TO TERM LOANS	1.0	2.2
TOTAL LOANS AND LEASES	6,445.9	6,319.9
Personal | Residential Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	813.7	1,018.1
2021/2020	726.3	660.3
2020/2019	603.8	213.0
2019/2018	195.8	110.4
2018/2017	109.0	139.8
PRIOR	723.6	763.1
REVOLVING LOANS	143.5	161.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	3,315.7	3,066.2
Personal | Residential Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	280.6	434.0
2021/2020	616.0	676.6
2020/2019	596.0	325.5
2019/2018	285.3	190.9
2018/2017	171.3	172.1
PRIOR	943.9	1,145.9
REVOLVING LOANS	185.1	218.1
REVOLVING LOANS CONVERTED TO TERM LOANS	1.0	2.2
TOTAL LOANS AND LEASES	3,079.2	3,165.3
Personal | Residential Real Estate | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	0.0	0.3
2021/2020	7.0	9.9
2020/2019	1.5	6.5
2019/2018	1.1	5.3
2018/2017	1.3	6.3
PRIOR	38.1	55.1
REVOLVING LOANS	2.0	5.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	51.0	88.4
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	26.9	63.6
2021/2020	44.4	0.0
2020/2019	0.0	21.8
2019/2018	21.5	10.4
2018/2017	7.8	0.0
PRIOR	32.6	5.0
REVOLVING LOANS	475.4	273.2
REVOLVING LOANS CONVERTED TO TERM LOANS	7.8	7.8
TOTAL LOANS AND LEASES	616.4	381.8
Personal | Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	3.0	27.5
2021/2020	0.0	0.0
2020/2019	0.0	1.2
2019/2018	0.9	0.0
2018/2017	4.6	0.0
PRIOR	2.4	1.0
REVOLVING LOANS	226.5	44.1
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	237.4	73.8
Personal | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	23.9	36.1
2021/2020	44.4	0.0
2020/2019	0.0	20.6
2019/2018	20.6	10.4
2018/2017	3.2	0.0
PRIOR	30.0	3.8
REVOLVING LOANS	248.9	229.1
REVOLVING LOANS CONVERTED TO TERM LOANS	7.8	7.8
TOTAL LOANS AND LEASES	378.8	307.8
Personal | Non-U.S. | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	0.0	0.0
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	0.0	0.0
PRIOR	0.2	0.2
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	0.2	0.2
Personal | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	195.1	35.2
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	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	195.1	35.2
Personal | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	70.0	13.4
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	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	70.0	13.4
Personal | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	125.1	21.8
2021/2020	0.0	0.0
2020/2019	0.0	0.0
2019/2018	0.0	0.0
2018/2017	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	125.1	$ 21.8
Personal | Other | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	0.0
2021/2020	0.0
2020/2019	0.0
2019/2018	0.0
2018/2017	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
TOTAL LOANS AND LEASES	$ 0.0