Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Supplemental Schedule of Noncash Investing and Financing Activities
Cash dividends declared, but not yet paid	[1]	$ 4.2	$ 4.2
Accrued capital expenditures	[1]	1.3	$ 1.0
Assets acquired, net of cash	[1]	30.6
Liabilities assumed	[1]	1.0
Promissory notes issued for acquisition	[1]	$ 0.5

[1] Amounts may not add due to rounding