Condensed Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Accumulated Other Compre- hensive Income (Loss)	(Distribution in Excess of Accumulated Earnings) Earnings Surplus	Non-Controlling Interest	Redeem- able Non- Controlling Interest	Impact of ASC 326 Adoption	Impact of ASC 326 Adoption (Distribution in Excess of Accumulated Earnings) Earnings Surplus	Impact of ASC 326 Adoption Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2018		72.0
Beginning balance at Dec. 31, 2018	$ 1,208.3	$ 1,793.4	$ (51.9)	$ (538.9)	$ 5.7
Total Equity
Net income (loss)	7.5			8.2	(0.7)
Other comprehensive income (loss), net of tax	(2.1)		(2.1)
Dividend on common stock	(22.4)			(22.4)
Distributions to noncontrolling interest	(0.3)				(0.3)
Share-based compensation	2.7	$ 2.7
Shares issued or repurchased, net (in shares)		0.2
Shares issued or repurchased, net	1.1	$ 0.2		0.9
Ending balance (in shares) at Jun. 30, 2019		72.2
Ending balance at Jun. 30, 2019	1,192.6	$ 1,795.9	(54.0)	(554.0)	4.7
Redeemable Non-Controlling Interest, beginning balance at Dec. 31, 2018						$ 7.9
Redeemable Non-Controlling Interest
Net income (loss)						0.0
Redeemable Non-Controlling Interest, ending balance at Jun. 30, 2019						7.9
Beginning balance (in shares) at Dec. 31, 2018		72.0
Beginning balance at Dec. 31, 2018	1,208.3	$ 1,793.4	(51.9)	(538.9)	5.7
Ending balance (in shares) at Dec. 31, 2019		72.3
Ending balance at Dec. 31, 2019	1,128.7	$ 1,800.1	(48.8)	(626.2)	3.6		$ (4.1)	$ (4.0)	$ (0.1)
Redeemable Non-Controlling Interest, beginning balance at Dec. 31, 2018						7.9
Redeemable Non-Controlling Interest, ending balance at Dec. 31, 2019	$ 6.3					6.3
Redeemable Non-Controlling Interest
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance (in shares) at Mar. 31, 2019		72.1
Beginning balance at Mar. 31, 2019	$ 1,205.5	$ 1,794.0	(52.6)	(541.3)	5.4
Total Equity
Net income (loss)	(1.2)			(0.8)	(0.4)
Other comprehensive income (loss), net of tax	(1.4)		(1.4)
Dividend on common stock	(11.9)			(11.9)
Distributions to noncontrolling interest	(0.3)				(0.3)
Share-based compensation	1.3	$ 1.3
Shares issued or repurchased, net (in shares)		0.1
Shares issued or repurchased, net	0.6	$ 0.6		0.0
Ending balance (in shares) at Jun. 30, 2019		72.2
Ending balance at Jun. 30, 2019	1,192.6	$ 1,795.9	(54.0)	(554.0)	4.7
Redeemable Non-Controlling Interest, beginning balance at Mar. 31, 2019						7.9
Redeemable Non-Controlling Interest
Net income (loss)						0.0
Redeemable Non-Controlling Interest, ending balance at Jun. 30, 2019						7.9
Beginning balance (in shares) at Dec. 31, 2019		72.3
Beginning balance at Dec. 31, 2019	1,128.7	$ 1,800.1	(48.8)	(626.2)	3.6		$ (4.1)	$ (4.0)	$ (0.1)
Total Equity
Net income (loss)	1.0			1.5	(0.5)
Other comprehensive income (loss), net of tax	(6.3)		(6.3)
Dividend on common stock	(13.8)			(13.8)
Disposal of M&C subsidiary	(3.0)				(3.0)
Share-based compensation	3.0	$ 3.0
Shares issued or repurchased, net (in shares)		0.0
Shares issued or repurchased, net	0.9			(0.9)
Ending balance (in shares) at Jun. 30, 2020		72.3
Ending balance at Jun. 30, 2020	1,104.6	$ 1,803.1	(55.1)	(643.4)	0.0
Redeemable Non-Controlling Interest, beginning balance at Dec. 31, 2019	6.3					6.3
Redeemable Non-Controlling Interest
Net income (loss)						(0.1)
Redeemable Non-Controlling Interest, ending balance at Jun. 30, 2020	$ 6.2					6.2
Redeemable Non-Controlling Interest
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance (in shares) at Mar. 31, 2020		72.3
Beginning balance at Mar. 31, 2020	$ 1,110.8	$ 1,801.6	(55.1)	(638.7)	3.0
Total Equity
Net income (loss)	(4.7)			(4.7)	0.0
Other comprehensive income (loss), net of tax	0.0
Disposal of M&C subsidiary	(3.0)				(3.0)
Share-based compensation	1.5	$ 1.5
Ending balance (in shares) at Jun. 30, 2020		72.3
Ending balance at Jun. 30, 2020	1,104.6	$ 1,803.1	$ (55.1)	$ (643.4)	$ 0.0
Redeemable Non-Controlling Interest, beginning balance at Mar. 31, 2020						6.2
Redeemable Non-Controlling Interest, ending balance at Jun. 30, 2020	$ 6.2					$ 6.2