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Debt (Details) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Credit Facility [Member]  
Debt Instrument [Line Items]  
Credit Facility, Term Loan Amount Outstanding $ 335.0
Credit facility, total borrowing capacity 1,000.0
Line of credit facility, revolving borrowing capacity 600.0
Aggregate principal amount of term loan 400.0
Line of Credit Facility, Periodic Payment 5.0
Letters of Credit Outstanding, Amount 43.2
Long-term Line of Credit 0.0
Unsecured Senior Notes Due 2019 [Member]  
Debt Instrument [Line Items]  
Senior Notes $ 500.0
Stated interest rate on unsecured senior notes 6.375%
Unsecured Senior Notes Due 2021 [Member]  
Debt Instrument [Line Items]  
Senior Notes $ 800.0