Accounts and Notes Receivable and Credit Quality of Notes Receivable - Components of Total Notes Receivable, Net (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accounts and notes receivable, net	$ 517.9	$ 577.3
Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	199.5	236.9
Notes receivable allowance for doubtful accounts	(8.1)	(5.6)
Accounts and notes receivable, net	191.4	231.3
Notes receivable, balances over 90 days past due	8.2	9.1
Notes receivable allowance for doubtful accounts, balances over 90 days past due	(4.7)	(3.3)
Notes receivable, net, balances over 90 days past due	3.5	5.8
Domestic | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	57.6	65.1
Notes receivable allowance for doubtful accounts	0	0
Notes receivable, balances over 90 days past due	1.9	0.4
Notes receivable allowance for doubtful accounts, balances over 90 days past due	0	0
International | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	141.9	171.8
Notes receivable allowance for doubtful accounts	(8.1)	(5.6)
Notes receivable, balances over 90 days past due	6.3	8.7
Notes receivable allowance for doubtful accounts, balances over 90 days past due	$ (4.7)	$ (3.3)