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Long-Term Debt and Notes Payable Short Term Borrowings (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Short-term Debt $ 127.5us-gaap_ShortTermBorrowings $ 100.8us-gaap_ShortTermBorrowings
Revolving Credit Facility [Member]    
Short-term Debt [Line Items]    
Short-term Debt 0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		 100.0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
Commercial Paper [Member]    
Short-term Debt [Line Items]    
Short-term Debt 126.7us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember		 0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
Other Liabilities [Member]    
Short-term Debt [Line Items]    
Short-term Debt $ 0.8us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_OtherLiabilitiesMember		 $ 0.8us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_OtherLiabilitiesMember