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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Gross unrecognized tax benefits, beginning of year $ 23.0 $ 23.9 $ 26.4
Increases in prior year tax positions 2.3 0.7 2.1
Decreases in prior year tax positions (0.5) (1.2) (5.6)
Increases for current year tax positions 3.1 2.2 3.4
Expiration of statute of limitations and audit settlements (8.9) (2.6) (2.4)
Gross unrecognized tax benefits, end of year 19.0 23.0 23.9
Potential interest and penalties 19.9 7.8 8.4
Balance, end of year $ 38.9 $ 30.8 $ 32.3