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Segment and Geographical Area Information (External Revenue and Long-Lived Assets) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue $ 202.1 $ 189.4 $ 391.9 $ 370.6  
Long-lived assets 122.6   122.6   $ 117.6
United States          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 151.2 136.5 292.1 266.4  
Long-lived assets 104.2   104.2   98.1
Total International          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 50.9 52.9 99.8 104.2  
Long-lived assets 18.4   18.4   19.5
United Kingdom          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 16.0 15.6 30.8 31.0  
Long-lived assets 8.4   8.4   8.1
Continental Europe          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 14.4 15.9 28.7 31.5  
Long-lived assets 2.0   2.0   2.1
Australia          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 8.0 9.2 15.7 17.4  
Long-lived assets 1.0   1.0   0.8
Canada          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 7.1 7.5 14.0 15.2  
Long-lived assets 0.7   0.7   0.9
Asia          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 4.4 3.9 8.8 7.6  
Long-lived assets 6.2   6.2   7.5
Other          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 1.0 $ 0.8 1.8 $ 1.5  
Long-lived assets $ 0.1   $ 0.1   $ 0.1