Supplemental Cash Flow and Noncash Investing Transactions (Tables)

12 Months Ended

Dec. 31, 2015

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	2015		2014		2013
Supplemental Cash Flow Information (in millions)
Interest paid (1)	$	144.4	$	142.6	$	148.7
Income taxes paid, net	13.3		18.7		7.4

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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.