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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill $ 23.2 $ 23.2
Intangible assets 21.6 25.5
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 10.4 15.9
Computer software assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets 11.2 9.6
Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill 78.6 78.6
Intangible assets 633.6 632.4
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 237.0 237.0
Cost | Computer software assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets 285.3 284.1
Accumulated Amortization and Impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill (55.4) (55.4)
Intangible assets (612.0) (606.9)
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 (226.6) (221.1)
Accumulated Amortization and Impairment | Computer software assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets $ (274.1) $ (274.5)