Condensed Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Balance (in shares) at Dec. 31, 2015		165.1
Balance at Dec. 31, 2015	$ 2,418.8	$ 165.1	$ 2,236.4	$ (492.5)	$ 509.8
Net income (loss)	(37.9)	0.0	0.0	0.0	(37.9)
Other comprehensive income	22.3	0.0	0.0	22.3	0.0
Dividends paid:
Common stock ($0.20 per share)	(33.0)	$ 0.0	0.0	0.0	(33.0)
Common stock issued for:
Other Transactions (in shares)		0.1
Other Transactions	1.0	$ 0.1	0.9	0.0	0.0
Stock-based compensation	1.6	$ 0.0	1.6	0.0	0.0
Balance (in shares) at Mar. 31, 2016		165.2
Balance at Mar. 31, 2016	2,372.8	$ 165.2	2,238.9	(470.2)	438.9
Balance (in shares) at Dec. 31, 2016		165.4
Balance at Dec. 31, 2016	2,273.0	$ 165.4	2,243.8	(510.0)	373.8
Net income (loss)	13.4	0.0	0.0	0.0	13.4
Other comprehensive income	7.9	0.0	0.0	7.9	0.0
Dividends paid:
Common stock ($0.20 per share)	$ (33.1)	$ 0.0	0.0	0.0	(33.1)
Common stock issued for:
Stock options exercised (in shares)	0.5	0.5
Stock options exercised	$ 8.8	$ 0.5	8.3	0.0	0.0
Other Transactions (in shares)		0.0
Other Transactions	0.6	$ 0.0	0.6	0.0	0.0
Stock-based compensation	1.0	$ 0.0	1.0	0.0	0.0
Balance (in shares) at Mar. 31, 2017		165.9
Balance at Mar. 31, 2017	$ 2,271.6	$ 165.9	$ 2,253.7	$ (502.1)	$ 354.1