Supplemental Cash Flow and Noncash Investing Transactions (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	2017		2016		2015
Supplemental Cash Flow Information (in millions)
Interest paid (1)	$	154.6	$	145.4	$	144.4
Income taxes paid, net	21.5		28.6		13.3