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Long-Term Debt Long-Term Debt (Schedule of Revolving Credit Facility) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Outstanding borrowings $ 1,337.4us-gaap_LongTermDebt $ 1,386.9us-gaap_LongTermDebt
Outstanding letters of credit 75.1us-gaap_LettersOfCreditOutstandingAmount  
Revolving Credit Facility [Member] | North America [Member]    
Debt Instrument [Line Items]    
Outstanding borrowings 136.8us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
225.0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
Total credit under facility 1,000.0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
1,000.0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
Undrawn availability 425.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
[1] 298.4us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
[1]
Interest rate 2.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
Outstanding letters of credit 58.5us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
112.7us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
Original issuance Jul. 31, 2011 Jul. 31, 2011
Maturity date Sep. 30, 2018 Sep. 30, 2018
Revolving Credit Facility [Member] | UNITED STATES [Member]    
Debt Instrument [Line Items]    
Undrawn availability 257.7us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
102.1us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Revolving Credit Facility [Member] | CANADA [Member]    
Debt Instrument [Line Items]    
Undrawn availability 54.3us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
53.1us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Revolving Credit Facility [Member] | Europe [Member]    
Debt Instrument [Line Items]    
Undrawn availability $ 113.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_EuropeMember
$ 143.2us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_EuropeMember
[1] Total undrawn availability for the U.S. borrower, the Canadian borrower and the European borrowers at December 31, 2014 is $257.7 million, $54.3 million and $113.0 million, respectively. Total undrawn availability for the U.S. borrower, the Canadian borrower and the European borrowers at December 31, 2013 is $102.1 million, $53.1 million and $143.2 million, respectively.