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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill $ 198.3 $ 198.4
Intangible assets 251.3 283.6
Intellectual property    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets 0.0 0.0
Other intangible assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets 242.3 269.8
Computer software assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets 9.0 13.8
Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill 253.7 253.8
Intangible assets 905.6 909.4
Cost | Intellectual property    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets 111.3 111.3
Cost | Other intangible assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets 503.2 508.0
Cost | Computer software assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets 291.1 290.1
Accumulated Amortization and Impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill (55.4) (55.4)
Intangible assets (654.3) (625.8)
Accumulated Amortization and Impairment | Intellectual property    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (111.3) (111.3)
Accumulated Amortization and Impairment | Other intangible assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (260.9) (238.2)
Accumulated Amortization and Impairment | Computer software assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets $ (282.1) $ (276.3)