Fair Value Measurements and the Fair Value Option - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unconsolidated investments	$ 1,114.6	$ 1,099.3
Marketable Securities	8.8	0.0
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unconsolidated investments	1,114.6	1,099.3
Marketable Securities	8.8
Total	1,080.2	1,064.6
Recurring [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net currency derivative contracts	(43.2)	(34.7)
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unconsolidated investments	0.0	0.0
Marketable Securities	8.8
Total	8.8	0.0
Recurring [Member] | Level 1 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net currency derivative contracts	0.0	0.0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unconsolidated investments		0.0
Marketable Securities	0.0
Total	(43.2)	(34.7)
Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net currency derivative contracts	(43.2)	(34.7)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unconsolidated investments	1,114.6	1,099.3
Marketable Securities	0.0
Total	1,114.6	1,099.3
Recurring [Member] | Level 3 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net currency derivative contracts	$ 0.0	$ 0.0