Accounts Receivable, Notes Receivable, Allowance for Doubtful Accounts and Bad Debt - Notes Receivable (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total accounts and notes receivable, net	$ 577.3	$ 220.2
Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable, gross	236.9
Allowance for doubtful accounts	(5.6)
Total accounts and notes receivable, net	231.3
Notes receivable, gross, balances over 90 days past due	9.1
Allowance for doubtful accounts, balances over 90 days past due	(3.3)
Notes receivable, net, balances over 90 days past due	5.8
Notes receivable, percent greater than 90 days past due	2.50%
Ending Balance Individually Evaluated for Impairment	104.5
Ending Balance Collectively Evaluated for Impairment	132.4
United States | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable, gross	65.1
Allowance for doubtful accounts	0
Notes receivable, gross, balances over 90 days past due	0.4
Allowance for doubtful accounts, balances over 90 days past due	0
Ending Balance Individually Evaluated for Impairment	4.8
Ending Balance Collectively Evaluated for Impairment	60.3
International | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable, gross	171.8
Allowance for doubtful accounts	(5.6)
Notes receivable, gross, balances over 90 days past due	8.7
Allowance for doubtful accounts, balances over 90 days past due	(3.3)
Ending Balance Individually Evaluated for Impairment	99.7
Ending Balance Collectively Evaluated for Impairment	$ 72.1