Description of the Business and Summary of Significant Accounting Policies - Accounts Receivable and Notes Receivable, net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and notes receivable, net	744.6	577.3
Notes receivable, net	188.7	158.7
Notes receivable, period deemed non-performing	180 days
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, payment terms	90 days
Notes receivable, imputed interest rate	4.00%	5.25%
Notes receivable, extended financing terms	18 months
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, payment terms	3 years
Notes receivable, imputed interest rate	10.40%	8.00%
Notes receivable, extended financing terms	36 months
Notes Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts and notes receivable, net	276.2	231.3
Notes receivable, net	188.7	158.7