Consolidated Statement of Comprehensive Income Parentheticals - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Unrealized Gain on Securities, Income Taxes	$ (0.3)	$ 0.1
Unrealized Gain on Derivatives, Income Tax	0.0	0.0
Defined Benefit Pension and Other Postretirement Benefit Plans, Income Tax	$ 0.1	$ 0.2