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Accounting Policies (Fair Value Measurement) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted amounts held in escrow-current $ 58.8 $ 28.9
Restricted amounts held in escrow-long term 63.4 60.2
Total assets at fair value 122.2 89.1
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted amounts held in escrow-current 58.8 28.9
Restricted amounts held in escrow-long term 63.4 60.2
Total assets at fair value 122.2 89.1
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted amounts held in escrow-current 0.0 0.0
Restricted amounts held in escrow-long term 0.0 0.0
Total assets at fair value 0.0 0.0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted amounts held in escrow-current 0.0 0.0
Restricted amounts held in escrow-long term 0.0 0.0
Total assets at fair value $ 0.0 $ 0.0