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1. Significant Accounting Policies Warranty rollforward (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty accrual, beginning of period $ 15.6us-gaap_ProductWarrantyAccrual $ 16.4us-gaap_ProductWarrantyAccrual
Provision for warranty 28.6us-gaap_ProductWarrantyAccrualWarrantiesIssued 15.6us-gaap_ProductWarrantyAccrualWarrantiesIssued
Actual warranty costs (26.4)us-gaap_ProductWarrantyAccrualPayments (16.4)us-gaap_ProductWarrantyAccrualPayments
Warranty accrual, end of period $ 17.8us-gaap_ProductWarrantyAccrual $ 15.6us-gaap_ProductWarrantyAccrual