Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

v2.4.1.9
Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 4.0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1.9us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property, accumulated depreciation and amortization $ 404.9us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 393.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Common shares, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common shares, shares authorized 1,000,000,000us-gaap_CommonStockSharesAuthorized 1,000,000,000us-gaap_CommonStockSharesAuthorized
Common shares, shares outstanding 92,500,000us-gaap_CommonStockSharesOutstanding 92,200,000us-gaap_CommonStockSharesOutstanding