Accounts and Notes Receivable and Credit Quality of Notes Receivable - Evaluation of Notes Receivable For Impairment (Details) (Notes Receivable, USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	$ 214.6	$ 236.9
Ending Balance Individually Evaluated for Impairment	104.3	104.5
Ending Balance Collectively Evaluated for Impairment	110.3	132.4
United States
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	61.7	65.1
Ending Balance Individually Evaluated for Impairment	12.6	4.8
Ending Balance Collectively Evaluated for Impairment	49.1	60.3
International
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	152.9	171.8
Ending Balance Individually Evaluated for Impairment	91.7	99.7
Ending Balance Collectively Evaluated for Impairment	$ 61.2	$ 72.1