Loans and Leases (Credit Quality Indicator At Amortized Cost By Origination Year) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	$ 5,341.2	$ 7,724.7
2021/2020	5,817.1	3,571.3
2020/2019	3,177.5	2,863.1
2019/2018	2,531.7	1,226.4
2018/2017	848.9	836.4
PRIOR	3,629.2	3,588.4
REVOLVING LOANS	19,537.3	20,378.9
REVOLVING LOANS CONVERTED TO TERM LOANS	324.9	291.4
TOTAL LOANS AND LEASES	41,207.8	40,480.6
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	4,019.7	5,171.3
2021/2020	3,407.1	1,770.3
2020/2019	1,604.6	1,806.1
2019/2018	1,441.9	660.8
2018/2017	475.0	423.9
PRIOR	1,535.8	1,449.6
REVOLVING LOANS	7,865.5	7,147.0
REVOLVING LOANS CONVERTED TO TERM LOANS	77.2	58.4
TOTAL LOANS AND LEASES	20,426.8	18,487.4
Commercial | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	909.3	2,079.4
2021/2020	1,958.9	757.9
2020/2019	662.1	922.7
2019/2018	640.5	387.7
2018/2017	238.2	308.6
PRIOR	813.8	773.7
REVOLVING LOANS	6,864.0	6,226.0
REVOLVING LOANS CONVERTED TO TERM LOANS	51.6	33.2
TOTAL LOANS AND LEASES	12,138.4	11,489.2
Commercial | Commercial and Institutional | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	442.6	1,042.0
2021/2020	1,133.2	310.2
2020/2019	357.0	468.9
2019/2018	296.7	163.9
2018/2017	56.7	55.4
PRIOR	551.7	541.6
REVOLVING LOANS	5,507.1	4,946.0
REVOLVING LOANS CONVERTED TO TERM LOANS	17.8	0.1
TOTAL LOANS AND LEASES	8,362.8	7,528.1
Commercial | Commercial and Institutional | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	466.7	993.4
2021/2020	794.3	441.7
2020/2019	305.1	406.7
2019/2018	318.1	193.6
2018/2017	155.9	243.3
PRIOR	256.6	230.2
REVOLVING LOANS	1,306.7	1,217.8
REVOLVING LOANS CONVERTED TO TERM LOANS	33.8	33.1
TOTAL LOANS AND LEASES	3,637.2	3,759.8
Commercial | Commercial and Institutional | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	0.0	44.0
2021/2020	31.4	6.0
2020/2019	0.0	47.1
2019/2018	25.7	30.2
2018/2017	25.6	9.9
PRIOR	5.5	1.9
REVOLVING LOANS	50.3	62.2
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	138.5	201.3
Commercial | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	429.1	1,434.8
2021/2020	1,367.1	943.5
2020/2019	833.8	821.9
2019/2018	734.8	271.2
2018/2017	236.8	106.2
PRIOR	403.7	473.0
REVOLVING LOANS	270.8	252.3
REVOLVING LOANS CONVERTED TO TERM LOANS	23.8	23.4
TOTAL LOANS AND LEASES	4,299.9	4,326.3
Commercial | Commercial Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	190.3	472.0
2021/2020	471.6	298.7
2020/2019	235.6	279.8
2019/2018	181.9	65.8
2018/2017	44.2	16.6
PRIOR	62.9	79.5
REVOLVING LOANS	189.6	67.5
REVOLVING LOANS CONVERTED TO TERM LOANS	2.1	2.9
TOTAL LOANS AND LEASES	1,378.2	1,282.8
Commercial | Commercial Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	231.0	912.7
2021/2020	884.1	644.8
2020/2019	598.2	491.5
2019/2018	502.9	205.4
2018/2017	192.6	89.6
PRIOR	340.8	390.6
REVOLVING LOANS	78.7	182.3
REVOLVING LOANS CONVERTED TO TERM LOANS	21.7	20.5
TOTAL LOANS AND LEASES	2,850.0	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	11.4	0.0
2020/2019	0.0	50.6
2019/2018	50.0	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	71.7	106.1
Commercial | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,584.9	986.4
2021/2020	81.1	68.9
2020/2019	108.7	61.5
2019/2018	66.6	1.9
2018/2017	0.0	9.1
PRIOR	307.3	191.9
REVOLVING LOANS	730.7	668.7
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8	1.8
TOTAL LOANS AND LEASES	2,881.1	1,990.2
Commercial | Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	982.3	816.5
2021/2020	62.0	68.9
2020/2019	108.7	38.4
2019/2018	43.5	0.0
2018/2017	0.0	9.1
PRIOR	6.5	0.0
REVOLVING LOANS	646.0	582.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	1,849.0	1,514.9
Commercial | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	602.5	167.0
2021/2020	19.1	0.0
2020/2019	0.0	0.0
2019/2018	0.0	1.9
2018/2017	0.0	0.0
PRIOR	300.8	191.9
REVOLVING LOANS	64.5	73.3
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8	1.8
TOTAL LOANS AND LEASES	988.7	435.9
Commercial | Non-U.S. | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	0.1	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	20.2	13.4
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	43.4	39.4
Commercial | Lease Financing, net
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	11.0	11.0
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	11.0	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 | Lease Financing, net | 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	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	1,096.4	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	1,096.4	670.7
Commercial | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	564.7	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	564.7	551.5
Commercial | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	531.7	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	531.7	119.2
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,321.5	2,553.4
2021/2020	2,410.0	1,801.0
2020/2019	1,572.9	1,057.0
2019/2018	1,089.8	565.6
2018/2017	373.9	412.5
PRIOR	2,093.4	2,138.8
REVOLVING LOANS	11,671.8	13,231.9
REVOLVING LOANS CONVERTED TO TERM LOANS	247.7	233.0
TOTAL LOANS AND LEASES	20,781.0	21,993.2
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	480.4	1,002.2
2021/2020	1,000.8	454.2
2020/2019	344.4	490.2
2019/2018	575.3	248.6
2018/2017	83.2	94.3
PRIOR	224.1	169.7
REVOLVING LOANS	10,940.0	12,574.1
REVOLVING LOANS CONVERTED TO TERM LOANS	238.9	223.0
TOTAL LOANS AND LEASES	13,887.1	15,256.3
Personal | Private Client | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	275.4	432.5
2021/2020	323.7	116.6
2020/2019	138.0	90.3
2019/2018	343.8	14.9
2018/2017	19.6	39.3
PRIOR	159.0	129.8
REVOLVING LOANS	5,835.0	7,592.8
REVOLVING LOANS CONVERTED TO TERM LOANS	29.8	44.7
TOTAL LOANS AND LEASES	7,124.3	8,460.9
Personal | Private Client | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	181.2	567.8
2021/2020	676.1	335.2
2020/2019	206.3	396.9
2019/2018	231.5	213.3
2018/2017	44.1	55.0
PRIOR	65.1	39.9
REVOLVING LOANS	5,104.1	4,979.8
REVOLVING LOANS CONVERTED TO TERM LOANS	209.1	178.3
TOTAL LOANS AND LEASES	6,717.5	6,766.2
Personal | Private Client | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	23.8	1.9
2021/2020	1.0	2.4
2020/2019	0.1	3.0
2019/2018	0.0	20.4
2018/2017	19.5	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	0.9	1.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	45.3	29.2
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	802.5	1,452.4
2021/2020	1,364.8	1,346.8
2020/2019	1,228.5	545.0
2019/2018	492.5	306.6
2018/2017	285.7	318.2
PRIOR	1,836.0	1,964.1
REVOLVING LOANS	372.2	384.6
REVOLVING LOANS CONVERTED TO TERM LOANS	1.0	2.2
TOTAL LOANS AND LEASES	6,383.2	6,319.9
Personal | Residential Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	608.3	1,018.1
2021/2020	847.1	660.3
2020/2019	578.5	213.0
2019/2018	197.6	110.4
2018/2017	94.0	139.8
PRIOR	816.1	763.1
REVOLVING LOANS	185.4	161.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	3,327.0	3,066.2
Personal | Residential Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	194.2	434.0
2021/2020	510.7	676.6
2020/2019	648.5	325.5
2019/2018	292.9	190.9
2018/2017	190.3	172.1
PRIOR	980.2	1,145.9
REVOLVING LOANS	185.2	218.1
REVOLVING LOANS CONVERTED TO TERM LOANS	1.0	2.2
TOTAL LOANS AND LEASES	3,003.0	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	2.0	5.3
2018/2017	1.4	6.3
PRIOR	39.7	55.1
REVOLVING LOANS	1.6	5.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	53.2	88.4
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	19.6	63.6
2021/2020	44.4	0.0
2020/2019	0.0	21.8
2019/2018	22.0	10.4
2018/2017	5.0	0.0
PRIOR	33.3	5.0
REVOLVING LOANS	359.6	273.2
REVOLVING LOANS CONVERTED TO TERM LOANS	7.8	7.8
TOTAL LOANS AND LEASES	491.7	381.8
Personal | Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	2.6	27.5
2021/2020	16.1	0.0
2020/2019	0.0	1.2
2019/2018	1.0	0.0
2018/2017	1.7	0.0
PRIOR	0.1	1.0
REVOLVING LOANS	115.1	44.1
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	136.6	73.8
Personal | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	17.0	36.1
2021/2020	28.3	0.0
2020/2019	0.0	20.6
2019/2018	21.0	10.4
2018/2017	3.3	0.0
PRIOR	33.0	3.8
REVOLVING LOANS	244.5	229.1
REVOLVING LOANS CONVERTED TO TERM LOANS	7.8	7.8
TOTAL LOANS AND LEASES	354.9	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	19.0	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	19.0	35.2
Personal | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1.0	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	1.0	13.4
Personal | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	18.0	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	18.0	$ 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