Accounts and Notes Receivable and Credit Quality of Notes Receivable (Components of Total Notes Receivable, Net) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total accounts and notes receivable, net	$ 713.5	$ 744.6
Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	238.0	282.1
Notes receivable allowance for doubtful accounts	(9.7)	(5.9)	$ (8.1)	$ (5.6)
Total accounts and notes receivable, net	228.3	276.2
Domestic | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	80.9	95.3
Notes receivable allowance for doubtful accounts	(1.9)	0.0
International | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable	157.1	186.8
Notes receivable allowance for doubtful accounts	(7.8)	(5.9)
Financing Receivables, Equal to Greater than 90 Days Past Due | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable past due	19.1	19.9
Notes receivable allowance for doubtful accounts, balances over 90 days past due	(6.7)	(3.5)
Notes receivable, net, balances over 90 days past due	12.4	16.4
Financing Receivables, Equal to Greater than 90 Days Past Due | Domestic | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable past due	6.0	7.9
Notes receivable allowance for doubtful accounts, balances over 90 days past due	(0.8)	0.0
Financing Receivables, Equal to Greater than 90 Days Past Due | International | Notes receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Notes receivable past due	13.1	12.0
Notes receivable allowance for doubtful accounts, balances over 90 days past due	$ (5.9)	$ (3.5)