Fair Value Measurements and the Fair Value Option - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unconsolidated investments	$ 206.1	$ 85.9
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0.3	6.5
Unconsolidated investments	206.1	85.9
Assets (liabilities), fair value disclosure	223.5	123.0
Recurring [Member] | Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract	20.0	23.9
Recurring [Member] | Currency Option Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract	(2.9)	6.7
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0.3	6.5
Unconsolidated investments	0.0	0.0
Assets (liabilities), fair value disclosure	0.3	6.5
Recurring [Member] | Level 1 [Member] | Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract	0.0	0.0
Recurring [Member] | Level 1 [Member] | Currency Option Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract	0.0	0.0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0.0	0.0
Unconsolidated investments	0.0	0.0
Assets (liabilities), fair value disclosure	17.1	30.6
Recurring [Member] | Level 2 [Member] | Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract	20.0	23.9
Recurring [Member] | Level 2 [Member] | Currency Option Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract	(2.9)	6.7
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0.0	0.0
Unconsolidated investments	206.1	85.9
Assets (liabilities), fair value disclosure	206.1	85.9
Recurring [Member] | Level 3 [Member] | Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract	0.0	0.0
Recurring [Member] | Level 3 [Member] | Currency Option Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract	$ 0.0	$ 0.0