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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Intangible assets          
Gross Carrying Amount, intangible assets subject to amortization $ 229.7   $ 229.7   $ 192.4
Accumulated Amortization, intangible assets subject to amortization (138.1)   (138.1)   (123.3)
Net Carrying Amount, intangible assets subject to amortization 91.6   91.6   69.1
Gross Carrying Amount, total intangible assets 230.3   230.3   193.0
Net Carrying Amount, total intangible assets 92.2   92.2   69.7
Amortization expense related to intangible assets subject to amortization 7.5 $ 5.4 14.4 $ 10.8  
In-process research and development          
Intangible assets          
Gross Carrying Amount, intangible assets not subject to amortization 0.6   0.6   0.6
Net Carrying Amount, intangible assets not subject to amortization 0.6   0.6   0.6
Existing technology and related patents          
Intangible assets          
Gross Carrying Amount, intangible assets subject to amortization 190.0   190.0   169.0
Accumulated Amortization, intangible assets subject to amortization (125.8)   (125.8)   (113.9)
Net Carrying Amount, intangible assets subject to amortization 64.2   64.2   55.1
Customer relationships          
Intangible assets          
Gross Carrying Amount, intangible assets subject to amortization 33.9   33.9   20.0
Accumulated Amortization, intangible assets subject to amortization (10.4)   (10.4)   (7.9)
Net Carrying Amount, intangible assets subject to amortization 23.5   23.5   12.1
Non compete contracts          
Intangible assets          
Gross Carrying Amount, intangible assets subject to amortization 1.8   1.8   1.8
Accumulated Amortization, intangible assets subject to amortization (1.3)   (1.3)   (1.1)
Net Carrying Amount, intangible assets subject to amortization 0.5   0.5   0.7
Trade names          
Intangible assets          
Gross Carrying Amount, intangible assets subject to amortization 4.0   4.0   1.6
Accumulated Amortization, intangible assets subject to amortization (0.6)   (0.6)   (0.4)
Net Carrying Amount, intangible assets subject to amortization $ 3.4   $ 3.4   $ 1.2