Consolidated Statements of Cash Flows (Parenthetical) - Pension Benefits [Member] - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Mar. 31, 2017	Jul. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Employer contributions			$ 143.4	$ 125.1
U.S. [Member]
Employer contributions	$ 135.0	$ 115.0