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Debt (Debt Covenants and Compliance) (Details)
6 Months Ended
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]  
Total leverage ratio, covenant compliance 2.45
Senior secured leverage ratio to consolidated EBITDA 1.96
Ratio of interest coverage 6.27
Minimum [Member]  
Debt Instrument [Line Items]  
Ratio of interest coverage, covenant compliance 3.50
Maximum [Member]  
Debt Instrument [Line Items]  
Total leverage ratio, covenant compliance 3.75
Senior secured leverage ratio to consolidated EBITDA 3.50
Financing Agreement, April 2014 [Member]  
Debt Instrument [Line Items]  
Senior secured credit facility $ 1,600,000,000
Maximum annual dividend payment $ 120,000,000
Financing Agreement, April 2014 [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Total leverage ratio 3.00
Senior secured leverage ratio 3.00
Total leverage ratio on unsecured debt 3.50