Basis of Presentation and Summary of Significant Accounting Policies (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Information
Interest paid, net of amounts capitalized	$ 57.8	$ 65.9	$ 76.5
Income taxes paid	6.5	34.0	1.5
Non-cash investing and financing activities:
Capital lease additions (see Note 13)	0.5	21.0	5.9
Leased equipment purchased through term loan	945.5	1,104.5
Acquisitions of businesses (see Note 2):
Fair value of assets acquired, net of cash	0.0	0.0	137.0
Liabilities assumed	0.0	0.0	(28.6)
Goodwill	0.0	0.0	33.8
Deferred payment for 2013 Proteus and Transpak acquisition	0.0	0.0	0.6
Deferred payment for 2014 UniGraphic acquisition	0.0	0.0	0.6
Acquisition of businesses—net of cash acquired	0.0	0.0	143.4
Equipment [Member]
Non-cash investing and financing activities:
Leased equipment purchased through term loan	$ 0.0	$ 0.0	$ 3.7