Segment Information (Total Revenue by Major Country) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 1,213.5	$ 1,188.0	$ 1,174.8	$ 1,186.9	$ 1,401.7	$ 1,424.2	$ 1,351.9	$ 1,393.5	$ 4,763.2	$ 5,571.3	$ 5,715.6
Brazil
Disaggregation of Revenue [Line Items]
Revenue									1,034.4	1,262.8	1,263.8
Mexico
Disaggregation of Revenue [Line Items]
Revenue									509.4	533.1	520.3
All other
Disaggregation of Revenue [Line Items]
Revenue									$ 3,219.4	$ 3,775.4	$ 3,931.5