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Consolidated Statements of Equity - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period				$ 414.9				$ 314.7	$ 414.9	$ 314.7	$ 191.6
Net income	$ 25.4	$ 21.5	$ 19.2	(0.8)	$ 39.2	$ 6.6	$ 23.0	12.4	65.3	81.2	89.3
Other comprehensive income (loss)									(0.6)	(5.2)	15.0
Incentive plan activity									13.0	10.3	11.3
Long-term incentive compensation expense									10.8	11.6	12.0
Restricted stock and restricted stock unit vesting									(6.6)	(8.7)	(4.5)
Stranded income tax effects resulting from tax reform - See Note 3										(4.8)
Adjustment related to redeemable noncontrolling interest (Note 15)									5.6	0.0	0.0
Balance at end of period	502.4				414.9				502.4	414.9	314.7
Common Stock
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period				0.5				0.5	0.5	0.5	0.5
Balance at end of period	0.5				0.5				0.5	0.5	0.5
Paid-In Capital
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period				1,295.4				1,309.8	1,295.4	1,309.8	1,307.9
Incentive plan activity									13.0	10.3	11.3
Long-term incentive compensation expense									10.8	11.6	12.0
Restricted stock and restricted stock unit vesting									(22.4)	(36.3)	(21.4)
Adjustment related to redeemable noncontrolling interest (Note 15)									5.6
Balance at end of period	1,302.4				1,295.4				1,302.4	1,295.4	1,309.8
Retained Deficit
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period				(650.1)				(742.3)	(650.1)	(742.3)	(831.6)
Net income									65.3	81.2	89.3
Stranded income tax effects resulting from tax reform - See Note 3										(4.8)
Balance at end of period	(584.8)				(650.1)				(584.8)	(650.1)	(742.3)
Accum. Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period				244.9				250.1	244.9	250.1	235.1
Other comprehensive income (loss)									(0.6)	(5.2)	15.0
Balance at end of period	244.3				244.9				244.3	244.9	250.1
Common Stock In Treasury
Increase (Decrease) in Stockholders' Equity
Balance at beginning of period				$ (475.8)				$ (503.4)	(475.8)	(503.4)	(520.3)
Restricted stock and restricted stock unit vesting									15.8	27.6	16.9
Balance at end of period	$ (460.0)				$ (475.8)				$ (460.0)	$ (475.8)	$ (503.4)
Accounting Standards Update 2016-01
Increase (Decrease) in Stockholders' Equity
Impact of adoption of ASU Adoption												$ 12.0
Accounting Standards Update 2016-01 | Retained Deficit
Increase (Decrease) in Stockholders' Equity
Impact of adoption of ASU Adoption												12.0
Accounting Standards Update 2014-09
Increase (Decrease) in Stockholders' Equity
Impact of adoption of ASU Adoption												4.0
Accounting Standards Update 2014-09 | Retained Deficit
Increase (Decrease) in Stockholders' Equity
Impact of adoption of ASU Adoption												4.0
Accounting Standards Update 2016-16
Increase (Decrease) in Stockholders' Equity
Impact of adoption of ASU Adoption												(0.2)
Accounting Standards Update 2016-16 | Retained Deficit
Increase (Decrease) in Stockholders' Equity
Impact of adoption of ASU Adoption												$ (0.2)

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