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Fair Value Measurements - Level 3 Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Changes in the fair value of items measured on a recurring basis and categorized as level 3 measurements        
Balance at the beginning of the period $ 2.3 $ 14.1 $ 7.0 $ 3.5
Realized and unrealized gains 0.2 0.0 0.2 0.0
Purchases 0.0 0.0 3.9 15.6
Settlements (2.1) (4.0) (9.4) (9.0)
Acquisition of Integrys 0.0 0.0 (1.3) 0.0
Balance at the end of period $ 0.4 $ 10.1 $ 0.4 $ 10.1