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Goodwill and Other Intangible Assets - Gross carrying amount and accumulated amortization of the company's intangible assets other than goodwill (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Intangible asset balances by major asset class    
Accumulated Amortization Amount $ (45.3) $ (43.3)
Gross Carrying Amount 159.4 162.6
Net Book Value 114.1 119.3
Customer relationships    
Intangible asset balances by major asset class    
Gross Carrying Amount 10.3 10.4
Accumulated Amortization Amount (7.8) (7.1)
Net Book Value 2.5 3.3
Patents    
Intangible asset balances by major asset class    
Gross Carrying Amount 28.5 29.1
Accumulated Amortization Amount (27.4) (26.6)
Net Book Value 1.1 2.5
Developed Technology Rights    
Intangible asset balances by major asset class    
Gross Carrying Amount 10.0 10.2
Accumulated Amortization Amount (9.9) (9.3)
Net Book Value 0.1 0.9
Other intangibles    
Intangible asset balances by major asset class    
Gross Carrying Amount 0.2 0.3
Accumulated Amortization Amount (0.2) (0.3)
Net Book Value 0.0 0.0
Trademarks and tradenames    
Intangible asset balances by major asset class    
Gross Carrying Amount 92.4 94.2
Distribution network    
Intangible asset balances by major asset class    
Gross Carrying Amount $ 18.0 $ 18.4