Loans and Leases (Credit Quality Indicator At Amortized Cost By Origination Year) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	$ 7,905.6	$ 7,724.7
2021/2020	5,484.1	3,571.3
2020/2019	2,791.4	2,863.1
2019/2018	2,007.3	1,226.4
2018/2017	746.1	836.4
PRIOR	3,012.1	3,588.4
REVOLVING LOANS	20,561.7	20,378.9
REVOLVING LOANS CONVERTED TO TERM LOANS	385.0	291.4
TOTAL LOANS AND LEASES	42,893.3	40,480.6
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	4,773.0	4,326.3
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	5,610.6	5,171.3
2021/2020	3,194.9	1,770.3
2020/2019	1,381.6	1,806.1
2019/2018	1,021.9	660.8
2018/2017	390.1	423.9
PRIOR	1,203.4	1,449.6
REVOLVING LOANS	8,760.2	7,147.0
REVOLVING LOANS CONVERTED TO TERM LOANS	72.9	58.4
TOTAL LOANS AND LEASES	21,635.6	18,487.4
Commercial | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,548.2	2,079.4
2021/2020	1,858.6	757.9
2020/2019	510.6	922.7
2019/2018	364.1	387.7
2018/2017	197.3	308.6
PRIOR	686.0	773.7
REVOLVING LOANS	7,199.6	6,226.0
REVOLVING LOANS CONVERTED TO TERM LOANS	50.6	33.2
TOTAL LOANS AND LEASES	12,415.0	11,489.2
Commercial | Commercial and Institutional | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	753.3	1,042.0
2021/2020	1,087.5	310.2
2020/2019	209.8	468.9
2019/2018	159.3	163.9
2018/2017	45.9	55.4
PRIOR	511.3	541.6
REVOLVING LOANS	6,032.8	4,946.0
REVOLVING LOANS CONVERTED TO TERM LOANS	17.7	0.1
TOTAL LOANS AND LEASES	8,817.6	7,528.1
Commercial | Commercial and Institutional | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	744.1	993.4
2021/2020	740.6	441.7
2020/2019	300.8	406.7
2019/2018	191.1	193.6
2018/2017	151.4	243.3
PRIOR	174.7	230.2
REVOLVING LOANS	1,102.3	1,217.8
REVOLVING LOANS CONVERTED TO TERM LOANS	32.9	33.1
TOTAL LOANS AND LEASES	3,437.9	3,759.8
Commercial | Commercial and Institutional | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	50.8	44.0
2021/2020	30.5	6.0
2020/2019	0.0	47.1
2019/2018	13.7	30.2
2018/2017	0.0	9.9
PRIOR	0.0	1.9
REVOLVING LOANS	64.5	62.2
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	159.5	201.3
Commercial | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,294.9	1,434.8
2021/2020	1,290.1	943.5
2020/2019	761.4	821.9
2019/2018	619.9	271.2
2018/2017	192.8	106.2
PRIOR	296.0	473.0
REVOLVING LOANS	297.4	252.3
REVOLVING LOANS CONVERTED TO TERM LOANS	20.5	23.4
TOTAL LOANS AND LEASES	4,773.0	4,326.3
Commercial | Commercial Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	318.7	472.0
2021/2020	227.4	298.7
2020/2019	123.6	279.8
2019/2018	123.5	65.8
2018/2017	39.8	16.6
PRIOR	39.1	79.5
REVOLVING LOANS	113.4	67.5
REVOLVING LOANS CONVERTED TO TERM LOANS	3.0	2.9
TOTAL LOANS AND LEASES	988.5	1,282.8
Commercial | Commercial Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	968.5	912.7
2021/2020	1,040.0	644.8
2020/2019	637.8	491.5
2019/2018	447.3	205.4
2018/2017	153.0	89.6
PRIOR	256.9	390.6
REVOLVING LOANS	181.5	182.3
REVOLVING LOANS CONVERTED TO TERM LOANS	17.5	20.5
TOTAL LOANS AND LEASES	3,702.5	2,937.4
Commercial | Commercial Real Estate | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	7.7	50.1
2021/2020	22.7	0.0
2020/2019	0.0	50.6
2019/2018	49.1	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	82.0	106.1
Commercial | Non-U.S
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,451.0	986.4
2021/2020	46.2	68.9
2020/2019	109.6	61.5
2019/2018	37.9	1.9
2018/2017	0.0	9.1
PRIOR	221.4	191.9
REVOLVING LOANS	1,263.2	668.7
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8	1.8
TOTAL LOANS AND LEASES	3,131.1	1,990.2
Commercial | Non-U.S | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	991.9	816.5
2021/2020	46.2	68.9
2020/2019	109.6	38.4
2019/2018	14.8	0.0
2018/2017	0.0	9.1
PRIOR	6.5	0.0
REVOLVING LOANS	1,158.3	582.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	2,327.3	1,514.9
Commercial | Non-U.S | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	459.0	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	214.9	191.9
REVOLVING LOANS	89.5	73.3
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8	1.8
TOTAL LOANS AND LEASES	765.2	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	15.4	13.4
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	38.6	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	1,316.5	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	1,316.5	670.7
Commercial | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	993.9	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	993.9	551.5
Commercial | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	322.6	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	322.6	119.2
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	2,295.0	2,553.4
2021/2020	2,289.2	1,801.0
2020/2019	1,409.8	1,057.0
2019/2018	985.4	565.6
2018/2017	356.0	412.5
PRIOR	1,808.7	2,138.8
REVOLVING LOANS	11,801.5	13,231.9
REVOLVING LOANS CONVERTED TO TERM LOANS	312.1	233.0
TOTAL LOANS AND LEASES	21,257.7	21,993.2
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	826.7	1,002.2
2021/2020	915.0	454.2
2020/2019	243.0	490.2
2019/2018	504.9	248.6
2018/2017	70.7	94.3
PRIOR	178.5	169.7
REVOLVING LOANS	11,084.8	12,574.1
REVOLVING LOANS CONVERTED TO TERM LOANS	295.4	223.0
TOTAL LOANS AND LEASES	14,119.0	15,256.3
Personal | Private Client | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	395.5	432.5
2021/2020	159.9	116.6
2020/2019	50.5	90.3
2019/2018	313.6	14.9
2018/2017	13.4	39.3
PRIOR	18.5	129.8
REVOLVING LOANS	5,352.5	7,592.8
REVOLVING LOANS CONVERTED TO TERM LOANS	28.2	44.7
TOTAL LOANS AND LEASES	6,332.1	8,460.9
Personal | Private Client | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	430.3	567.8
2021/2020	755.1	335.2
2020/2019	192.4	396.9
2019/2018	191.3	213.3
2018/2017	38.7	55.0
PRIOR	160.0	39.9
REVOLVING LOANS	5,728.6	4,979.8
REVOLVING LOANS CONVERTED TO TERM LOANS	267.2	178.3
TOTAL LOANS AND LEASES	7,763.6	6,766.2
Personal | Private Client | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	0.9	1.9
2021/2020	0.0	2.4
2020/2019	0.1	3.0
2019/2018	0.0	20.4
2018/2017	18.6	0.0
PRIOR	0.0	0.0
REVOLVING LOANS	3.7	1.5
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	23.3	29.2
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	1,225.9	1,452.4
2021/2020	1,330.2	1,346.8
2020/2019	1,166.8	545.0
2019/2018	459.2	306.6
2018/2017	277.5	318.2
PRIOR	1,624.9	1,964.1
REVOLVING LOANS	320.1	384.6
REVOLVING LOANS CONVERTED TO TERM LOANS	8.9	2.2
TOTAL LOANS AND LEASES	6,413.5	6,319.9
Personal | Residential Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	871.6	1,018.1
2021/2020	666.7	660.3
2020/2019	567.7	213.0
2019/2018	168.1	110.4
2018/2017	102.9	139.8
PRIOR	750.8	763.1
REVOLVING LOANS	128.4	161.5
REVOLVING LOANS CONVERTED TO TERM LOANS	7.9	0.0
TOTAL LOANS AND LEASES	3,264.1	3,066.2
Personal | Residential Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	354.3	434.0
2021/2020	656.7	676.6
2020/2019	597.6	325.5
2019/2018	290.0	190.9
2018/2017	170.9	172.1
PRIOR	838.2	1,145.9
REVOLVING LOANS	180.4	218.1
REVOLVING LOANS CONVERTED TO TERM LOANS	1.0	2.2
TOTAL LOANS AND LEASES	3,089.1	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	6.8	9.9
2020/2019	1.5	6.5
2019/2018	1.1	5.3
2018/2017	3.7	6.3
PRIOR	35.9	55.1
REVOLVING LOANS	11.3	5.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	60.3	88.4
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	27.2	63.6
2021/2020	44.0	0.0
2020/2019	0.0	21.8
2019/2018	21.3	10.4
2018/2017	7.8	0.0
PRIOR	5.3	5.0
REVOLVING LOANS	396.6	273.2
REVOLVING LOANS CONVERTED TO TERM LOANS	7.8	7.8
TOTAL LOANS AND LEASES	510.0	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	3.7	0.0
2020/2019	0.0	1.2
2019/2018	0.0	0.0
2018/2017	4.6	0.0
PRIOR	2.3	1.0
REVOLVING LOANS	124.6	44.1
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	138.2	73.8
Personal | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	24.2	36.1
2021/2020	40.3	0.0
2020/2019	0.0	20.6
2019/2018	21.3	10.4
2018/2017	3.2	0.0
PRIOR	2.9	3.8
REVOLVING LOANS	272.0	229.1
REVOLVING LOANS CONVERTED TO TERM LOANS	7.8	7.8
TOTAL LOANS AND LEASES	371.7	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	0.1	0.2
REVOLVING LOANS	0.0	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0	0.0
TOTAL LOANS AND LEASES	0.1	0.2
Personal | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	215.2	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	215.2	35.2
Personal | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	190.8	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	190.8	13.4
Personal | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2022/2021	24.4	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	$ 24.4	$ 21.8