Fair Value Measurements (Schedule of Fair Value Measurements) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unconsolidated investments	$ 78.5	$ 81.1
Investments in KWE		0
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	11.0	4.0
Unconsolidated investments	0
Currency forward contract	0
Assets, fair value disclosure	11.0	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	(1.1)	(9.6)
Assets, fair value disclosure	(1.1)	(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	78.5	81.1
Currency forward contract	0
Assets, fair value disclosure	78.5	81.1
Recurring [Member] | Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	11.0	4.0
Unconsolidated investments	78.5	81.1
Currency forward contract	(1.1)	(9.6)
Assets, fair value disclosure	88.4	75.5
KWE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Shares in KWE	13.2
Marketable Securities [Member] | KWE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in KWE	$ 248.5