Equity-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	10,900,000		10,900,000
Weighted-Average Price [Abstract]
Equity-based compensation			$ 20.7		$ 20.0
Continuing Operations [Member]
Weighted-Average Price [Abstract]
Equity-based compensation	6.4	5.5	17.7		17.9
Discontinued Operations [Member]
Weighted-Average Price [Abstract]
Equity-based compensation	0.9	1.3	3.0		2.1
Stock Options [Member]
Options Outstanding [RollForward]
Outstanding Beginning Balance (in shares)			1,794,187
Granted (in shares)			282,236
Exercised (in shares)			(65,366)
Forfeited (in shares)			(14,842)
Outstanding Ending Balance (in shares)	1,996,215		1,996,215
Options Excercisable (in shares)	1,452,138		1,452,138
Unvested Options (in shares)	544,077		544,077
Weighted-Average Price [Abstract]
Weighted-Average Price, beginning (in dollars per share)			$ 27.90
Weighted-Average Price, Granted (in dollars per share)			$ 31.67
Weighted-Average Price, Exercised (in dollars per share)			$ 22.24
Weighted-Average Price, Forfeited (in dollars per share)			$ 30.53
Weighted-Average Price, Ending (in dollars per share)	$ 28.60		$ 28.60
Weighted-Average Price, Options Excercisable	$ 27.71		$ 27.71
Weighted-Average Price, Unvested Options	$ 30.97		$ 30.97
Weighted-Average Remaining Contractual Term, Outstanding			3 years 5 months 4 days
Aggregate Intrinsic Value, Outstanding	6.3		6.3
Weighted-Average Remaining Contractual Term, Options Excercisable			2 years 6 months 22 days
Aggregate Intrinsic Value, Options Excercisable	6.2		6.2
Weighted-Average Remaining Contractual Term, Unvested Options			5 years 8 months 29 days
Aggregate Intrinsic Value, Unvested Options	0.2		0.2
Intrinsic value of options exercised			0.6		4.2
Unrecognized compensation cost	2.7		2.7
Weighted-average period for recognition of compensation costs			2 years 20 days
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options			1.5
Restricted Stock [Member]
Options Outstanding [RollForward]
Total fair value of stock that vested			20.2		18.4
Shares Outstanding [Roll Forward]
Balance, beginning (in shares)			1,388,953
Granted (in shares)			968,118
Vested and paid out (in shares)			(637,677)
Forfeited (in shares)			(116,238)
Balance, Ending (in shares)	1,603,156		1,603,156
Weighted-Average Price [Abstract]
Weighted-Average Price, Forfeited (in dollars per share)			$ 30.96
Weighted-Average Price, beginning balance (in dollars per share)			$ 30.96
Weighted-Average Price, Granted (in dollars per share)			$ 31.82		$ 30.03
Weighted-Average Price, Vested and paid out (in dollars per share)			$ 31.63
Weighted-Average Price, Ending Balance (in dollars per share)	$ 31.22		$ 31.22
Unrecognized compensation cost	18.2		18.2
Weighted-average period for recognition of compensation costs			2 years 3 months 4 days
Vesting period (in years)			3 years 0 months 0 days
Performance Share Units [Member]
Shares Outstanding [Roll Forward]
Balance, beginning (in shares)			480,660
Granted (in shares)			252,161
Vested and paid out (in shares)			(55,659)
Forfeited (in shares)			(22,416)
Vested and canceled (in shares)			(51,361)	[1]
Balance, Ending (in shares)	603,385		603,385
Weighted-Average Price [Abstract]
Weighted-Average Price, Forfeited (in dollars per share)			$ 30.47
Weighted-Average Price, beginning balance (in dollars per share)			$ 32.33
Weighted-Average Price, Granted (in dollars per share)			$ 31.71		$ 30.12
Weighted-Average Price, Vested and paid out (in dollars per share)			$ 39.07
Weighted-Average Price, Vested and canceled (in dollars per share)			$ 39.07
Weighted-Average Price, Ending Balance (in dollars per share)	$ 30.92		$ 30.92
Unrecognized compensation cost	$ 3.2		$ 3.2
Weighted-average period for recognition of compensation costs			2 years 24 days

[1] Represents units that were not paid out due to not meeting performance targets. Payout of the performance share units is dependent upon the Company’s total shareholder return compared to a group of its peers over a three-year period.