Fair Value Measurements (Schedule of Fair Value Measurements) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unconsolidated investments	$ 82.0	$ 81.1
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	8.5	4.0
Unconsolidated investments	0
Currency forward contract	0
Assets, fair value disclosure	8.5	4.0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Unconsolidated investments	0
Currency forward contract	(11.2)	(9.6)
Assets, fair value disclosure	(11.2)	(9.6)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Unconsolidated investments	82.0	81.1
Currency forward contract	0
Assets, fair value disclosure	82.0	81.1
Recurring [Member] | Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	8.5	4.0
Unconsolidated investments	82.0	81.1
Currency forward contract	(11.2)	(9.6)
Assets, fair value disclosure	$ 79.3	$ 75.5