Consolidated Statement of Shareholders' Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Millions	Total	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Common Stock [Member]
Beginning Balance at Dec. 31, 2016	$ 1,893.0	$ 625.9	$ (28.2)	$ 1,295.3
Comprehensive Income [Abstract]
Net Income	85.9	85.9
Other Comprehensive Income – Net of Tax [Abstract]
Currency Translation Adjustments	(0.2)		(0.2)
Unrealized Gain on Securities	0.7		0.7
Defined Benefit Pension and Other Postretirement Plans	0.4		0.4
Total Comprehensive Income	86.8
Common Stock Issued	91.2			91.2
Dividends Declared	(54.0)	(54.0)
Ending Balance at Jun. 30, 2017	$ 2,017.0	$ 657.8	$ (27.3)	$ 1,386.5