Consolidated Statement of Comprehensive Income Parentheticals - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Unrealized Loss on Securities, Taxes	$ (0.3)	$ (0.2)	$ 0.0
Unrealized Gain on Derivatives, Taxes	0.1	0.1	0.0
Defined Benefit Pension and Other Postretirement Benefit Plans, Taxes	$ (2.2)	$ (2.8)	$ 3.3