Segment Information (Long-Lived Assets by Major Country) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$ 893.7	$ 1,125.6	$ 1,156.9
Brazil
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	283.2	396.9	400.9
U.S.
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	152.6	174.4	196.1
All other
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$ 458.0	$ 554.3	$ 559.9