Borrowing Arrangements (Fair Value Adjustment) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Debt Disclosure [Abstract]
Unamortized fair value adjustment related to long-term debt	$ 33.6
Amortization of fair value adjustment	16.2
Estimated aggregate amortization of fair value adjustment related to long-term debt (reduction of interest expense) for each of the next five years:
2016	11.2
2017	6.6
2018	2.7
2019	2.0
2020	$ 1.5