Supplemental Cash Flow and Noncash Investing Transactions (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	2016		2015		2014
Supplemental Cash Flow Information (in millions)
Interest paid (1)	$	145.4	$	144.4	$	142.6
Income taxes paid, net	28.6		13.3		18.7

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(1) Interest paid consisted of interest on debt obligations, interest rate swaps (net of interest received), and capital leases. The interest expense we capitalized as part of the cost of construction of major assets was immaterial for all periods presented.