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Goodwill and Other intangible assets - Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Gross carrying amount $ 806.1   $ 806.1   $ 806.9
Accumulated amortization 69.9   69.9   56.8
Net carrying amount 736.2   736.2   750.1
Finite-Lived Intangible Assets, Net [Abstract]          
Amortization expense relating to intangible assets 4.6 4.3 13.7 10.5  
Trade Names [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Gross carrying amount 571.7   571.7   575.3
Accumulated amortization 0   0   0
Net carrying amount 571.7   571.7   575.3
Contractual or Distributer Relationships [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Gross carrying amount 88.9   88.9   90.0
Accumulated amortization 9.1   9.1   4.7
Net carrying amount 79.8   79.8   85.3
Useful life (in years)     15 years    
Technology and Other [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Gross carrying amount 93.2   93.2   93.2
Accumulated amortization 30.9   30.9   25.5
Net carrying amount 62.3   62.3   67.7
Technology and Other [Member] | Minimum [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Useful life (in years)     4 years    
Technology and Other [Member] | Maximum [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Useful life (in years)     10 years    
Patents, Other Trademarks and Other Trade Names [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Gross carrying amount 27.4   27.4   27.4
Accumulated amortization 13.9   13.9   12.2
Net carrying amount 13.5   13.5   15.2
Patents, Other Trademarks and Other Trade Names [Member] | Minimum [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Useful life (in years)     5 years    
Patents, Other Trademarks and Other Trade Names [Member] | Maximum [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Useful life (in years)     20 years    
Customer Databases, Relationships, and Reacquired Rights [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Gross carrying amount 24.9   24.9   21.0
Accumulated amortization 16.0   16.0   14.4
Net carrying amount $ 8.9   $ 8.9   $ 6.6
Customer Databases, Relationships, and Reacquired Rights [Member] | Minimum [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Useful life (in years)     2 years    
Customer Databases, Relationships, and Reacquired Rights [Member] | Maximum [Member]
          
Intangible Assets, Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]          
Useful life (in years)     5 years