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Fair Value on a Nonrecurring Basis (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Level 1  
Fair value assets and liabilities measured on nonrecurring basis  
Fair Value $ 0.0
Level 2  
Fair value assets and liabilities measured on nonrecurring basis  
Fair Value 1,574.7
Level 3  
Fair value assets and liabilities measured on nonrecurring basis  
Fair Value 65.4
Fair Value, Total  
Fair value assets and liabilities measured on nonrecurring basis  
Fair Value $ 1,640.1