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Goodwill and intangible assets - Components of goodwill and intangible assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite lived intangible Asset      
Accumulated Amortization $ (41.8) $ (26.0)  
Impairments 0.0 0.0  
Foreign currency translation 0.0 0.0  
Net Balance 157.7 173.5 $ 189.3
Goodwill      
Gross Balance 400.7 400.7  
Impairments 0.0 0.0  
Foreign currency translation 0.1 (0.1)  
Net Balance 400.8 400.6 401.0
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]      
Gross Balance 22.1 22.1 27.0
Impairments 0.0 (8.0)  
Foreign currency translation 0.0 0.0  
Gross carrying amount of intangible assets 622.3 635.3  
Impairment of intangible assets 0.0 (13.0)  
Foreign currency translation including goodwill 0.1 (0.1)  
Net carrying amount of intangible assets 580.6 596.2 617.3
Amortization of intangible assets 15.8 15.8 $ 10.2
Insurance licenses      
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]      
Gross Balance 8.1 8.1  
Impairments 0.0 0.0  
Foreign currency translation 0.0 0.0  
Net Balance 8.1 8.1  
Trade Names      
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]      
Gross Balance 14.0 27.0  
Impairments 0.0 (13.0)  
Net Balance 14.0 14.0  
Customer relationships      
Finite lived intangible Asset      
Gross Balance 17.0 17.0  
Accumulated Amortization (3.5) (2.2)  
Impairments 0.0 0.0  
Foreign currency translation 0.0 0.0  
Net Balance 13.5 14.8  
Distribution relationships      
Finite lived intangible Asset      
Gross Balance 151.0 151.0  
Accumulated Amortization (25.5) (15.8)  
Impairments 0.0 0.0  
Foreign currency translation 0.0 0.0  
Net Balance 125.5 135.2  
Technology      
Finite lived intangible Asset      
Gross Balance 15.5 15.5  
Accumulated Amortization (6.9) (4.3)  
Impairments 0.0 0.0  
Foreign currency translation 0.0 0.0  
Net Balance 8.6 11.2  
Trade Names      
Finite lived intangible Asset      
Gross Balance 16.0 16.0  
Accumulated Amortization (5.9) (3.7)  
Impairments 0.0 0.0  
Foreign currency translation 0.0 0.0  
Net Balance $ 10.1 $ 12.3