CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (PARENTHETICAL) - Long-term Debt shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2017 USD ($) shares
2017 Junior Convertible Debt
2017 Junior Notes Issued	$ 111.3
2007 Junior Convertible Debt
Stock issued during period, shares, exchange of convertible securities | shares	3.2
2007 Junior Notes Exchanged	$ 111.3