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Revenue recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 03, 2019	Aug. 04, 2018	Aug. 03, 2019	Aug. 04, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 1,364.4	$ 1,420.1	$ 2,796.1	$ 2,900.7
Bridal
Disaggregation of Revenue [Line Items]
Sales	607.6	636.9	1,250.9	1,310.4
Fashion
Disaggregation of Revenue [Line Items]
Sales	456.6	447.7	946.4	934.7
Watches
Disaggregation of Revenue [Line Items]
Sales	92.3	104.8	174.5	196.1
Other
Disaggregation of Revenue [Line Items]
Sales	207.9	230.7	424.3	459.5
Store
Disaggregation of Revenue [Line Items]
Sales	1,198.0	1,267.9	2,455.5	2,597.9
Kay
Disaggregation of Revenue [Line Items]
Sales	528.9	546.0	1,103.7	1,129.2
Zales
Disaggregation of Revenue [Line Items]
Sales	275.9	278.5	560.9	576.6
Jared
Disaggregation of Revenue [Line Items]
Sales	254.6	271.2	509.6	538.7
Piercing Pagoda
Disaggregation of Revenue [Line Items]
Sales	74.2	67.6	156.8	142.0
James Allen
Disaggregation of Revenue [Line Items]
Sales	53.6	54.4	105.6	107.7
Peoples
Disaggregation of Revenue [Line Items]
Sales	45.5	47.7	87.2	94.4
Regional banners
Disaggregation of Revenue [Line Items]
Sales	8.3	21.3	17.5	45.9
International segment
Disaggregation of Revenue [Line Items]
Sales	113.9	131.5	225.4	260.2
Other
Disaggregation of Revenue [Line Items]
Sales	9.5	1.9	29.4	6.0
E-commerce
Disaggregation of Revenue [Line Items]
Sales	156.9	150.3	311.2	296.8
Other
Disaggregation of Revenue [Line Items]
Sales	9.5	1.9	29.4	6.0
North America
Disaggregation of Revenue [Line Items]
Sales	1,241.0	1,286.7	2,541.3	2,634.5
North America | Bridal
Disaggregation of Revenue [Line Items]
Sales	560.3	585.1	1,155.0	1,203.0
North America | Fashion
Disaggregation of Revenue [Line Items]
Sales	435.4	420.5	902.8	881.6
North America | Watches
Disaggregation of Revenue [Line Items]
Sales	53.0	58.0	101.2	110.2
North America | Other
Disaggregation of Revenue [Line Items]
Sales	192.3	223.1	382.3	439.7
North America | Store
Disaggregation of Revenue [Line Items]
Sales	1,097.2	1,150.2	2,254.5	2,363.9
North America | Kay
Disaggregation of Revenue [Line Items]
Sales	528.9	546.0	1,103.7	1,129.2
North America | Zales
Disaggregation of Revenue [Line Items]
Sales	275.9	278.5	560.9	576.6
North America | Jared
Disaggregation of Revenue [Line Items]
Sales	254.6	271.2	509.6	538.7
North America | Piercing Pagoda
Disaggregation of Revenue [Line Items]
Sales	74.2	67.6	156.8	142.0
North America | James Allen
Disaggregation of Revenue [Line Items]
Sales	53.6	54.4	105.6	107.7
North America | Peoples
Disaggregation of Revenue [Line Items]
Sales	45.5	47.7	87.2	94.4
North America | Regional banners
Disaggregation of Revenue [Line Items]
Sales	8.3	21.3	17.5	45.9
North America | International segment
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
North America | Other
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
North America | E-commerce
Disaggregation of Revenue [Line Items]
Sales	143.8	136.5	286.8	270.6
North America | Other
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment
Disaggregation of Revenue [Line Items]
Sales	113.9	131.5	225.4	260.2
International segment | Bridal
Disaggregation of Revenue [Line Items]
Sales	47.3	51.8	95.9	107.4
International segment | Fashion
Disaggregation of Revenue [Line Items]
Sales	21.2	27.2	43.6	53.1
International segment | Watches
Disaggregation of Revenue [Line Items]
Sales	39.3	46.8	73.3	85.9
International segment | Other
Disaggregation of Revenue [Line Items]
Sales	6.1	5.7	12.6	13.8
International segment | Store
Disaggregation of Revenue [Line Items]
Sales	100.8	117.7	201.0	234.0
International segment | Kay
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | Zales
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | Jared
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | Piercing Pagoda
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | James Allen
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | Peoples
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | Regional banners
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | International segment
Disaggregation of Revenue [Line Items]
Sales	113.9	131.5	225.4	260.2
International segment | Other
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | E-commerce
Disaggregation of Revenue [Line Items]
Sales	13.1	13.8	24.4	26.2
International segment | Other
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other
Disaggregation of Revenue [Line Items]
Sales	9.5	1.9	29.4	6.0
Other | Bridal
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Fashion
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Watches
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Sales	9.5	1.9	29.4	6.0
Other | Store
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Kay
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Zales
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Jared
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Piercing Pagoda
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | James Allen
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Peoples
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Regional banners
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | International segment
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Sales	9.5	1.9	29.4	6.0
Other | E-commerce
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Sales	$ 9.5	$ 1.9	$ 29.4	$ 6.0

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