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Income Taxes (ASC 740-10) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Income Tax Contingency [Line Items]          
Percentage of likelihood for realization of benefit upon ultimate settlement   50.00%      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns          
Balance at beginning $ 35.0 $ 35.0 $ 33.7 $ 40.0  
Changes in prior year tax positions (10.7)   (4.9) 1.0  
Tax positions taken during the current year 0.0        
Lapse in statute of limitations 0.0   1.1 0.0  
Settlements with tax authorities 0.0     (0.3)  
Tax positions taken during the current year     7.3 7.0  
Balance at year end   24.3 35.0 33.7  
Unrecognized tax benefit recognition including interest and penalties, if recognized, would effect income tax expense   13.6     $ 5.0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   1.7 (2.2) 0.7  
Permanent Differences [Member]          
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns          
Balance at beginning 5.4 5.4 8.4 8.4  
Changes in prior year tax positions 0.0   (2.2) 0.0  
Tax positions taken during the current year 0.0        
Lapse in statute of limitations 0.0   0.8 0.0  
Settlements with tax authorities 0.0     0.0  
Tax positions taken during the current year     0.0 0.0  
Balance at year end   5.4 5.4 8.4  
Temporary Differences [Member]          
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns          
Balance at beginning 23.1 23.1 16.6 23.6  
Changes in prior year tax positions (12.4)   (0.8) 0.0  
Tax positions taken during the current year   0.0      
Lapse in statute of limitations 0.0   0.0 0.0  
Settlements with tax authorities 0.0     0.0  
Tax positions taken during the current year     7.3 7.0  
Balance at year end   10.7 23.1 16.6  
Interest and Penalties Net of Tax Benefit [Member]          
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns          
Balance at beginning 6.5 6.5 8.7 8.0  
Changes in prior year tax positions 1.7   (1.9) 1.0  
Tax positions taken during the current year 0.0        
Lapse in statute of limitations 0.0   0.3 0.0  
Settlements with tax authorities $ 0.0     (0.3)  
Tax positions taken during the current year     0.0 0.0  
Balance at year end   $ 8.2 $ 6.5 $ 8.7