Business Segments - Long-lived Assets by Geographic Location (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 191.3	$ 152.8	$ 139.2
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	132.7	99.0	79.4
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	9.5	12.5	14.0
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 49.1	$ 41.3	$ 45.8